M. - you have such great information in the other posts from the other moms.
Some mentioned how important it is to pump every 2 to 3 hours initially to bring your milk in at first, and that really does include nighttimes. My son was born 6 1/2 weeks early and in the NICU for 3 weeks. I worked long and hard with the LC, even after he came home, to establish my milk supply and also to get him to breastfeed since premature baby boys sometimes just don't take to it as well as premature baby girls. I pump more than breast feed him now at 6 1/2 months because he became very interested in his surroundings around 4 months and we were really worried about him continuing to gain weight. He would take more from the bottle because he could look around the room then when he was eating. Since I knew I would be pumping when I went back to work, I just started to give him bottles of breastmilk at times and breastfeed at times when he would do a good nursing session. Some people I know hated pumping, because they would rather be having the personally connection during the feeding. I love the personal connection, but making sure my son got enough milk during the day to meet his nutritional needs and gain weight (while taking breastmilk and not formula) helped me deal with the disappointment that he was not getting it from me solely from breastfeeding.
My advice is to be very diligent about your pump schedule in the beginning. It is so important to establish a good supply early on, and then you should not have a supply problem. It sounds like you are off to a great start. My milk came in more slowly at first, but my the time he was eating from a bottle, I was producing 2 to 3 times the amount that he needed in a day. So as long as you are producing more or the same as what he is eating, don't worry. Don't skip pumping at night, your body is not ready for that yet. In the night time my LC said I could only go as long as every 4 hours from the beginning of my pumping and to only go that long for 2 pumps that night. So I pumped at 11pm, 3am and 7am. The rest of the day I pumped every 2 to 3 hours religiously. I pumped for 25 to 30 minutes to establish my supply and kept doing that until I started to have an oversupply problem when he was about 2 months old. At that point he could not handle my strong letdown so was getting frustrated when breastfeeding. Then I started regulating my milk to fit how much he would eat in a day. So if he at 3 ounces from a bottle, I would pump 3 ounces out after he ate. Another thing I did that cost us I think $20 a week was when I was establishing my supply I rented a hospital grade pump for the first month to make sure I completly established my supply while he in the hospital and only breastfeeding 1 time a day if we were lucky (he was bottle or tube fed the rest of the feedings). I started using my Medela Pump in Style 3 weeks into my pumping and kept the hospital grade pump one more week to make sure my supply did not go down when I switched pumps.
Stress does affect your supply, as does lack of sleep and not eating and drinking enough. It is hard to take care of yourself when you have to wake up to pump every 4 hours or breastfeed (if you are lucky enough for him to breastfeed from you at night). If you are worried about his getting enough, count the wet diapers (6 to 8 a day) and you can even do weight checks. We did weekly weight checks since our little one could not afford to loose any weight. If you feel you need to pump and give him the bottle with breastmilk because he eats more, do it. That is what we do and it has worked out great. Also that way I can see exactly how much he gets a day from the bottle and I do strict timing of when he is actually drinking during breastfeeding (not just taking a minute rest or cat-nap on the breast) and they helps monitor how much they are eating.
Don't freak about the pacifier. Our son had it and a bottle for his 3 week NICU visit before he came home and just decided one day when he was 2 1/2 months old that he did not want a pacifier. He refuses them to this day. But it did not hurt us at all with breastfeeding, and neither did him eating from a bottle. We did switch him to wide nipples for bottles the day he came home from the hospital though, since that is closer to your nipple. He goes back and forth happily now between bottle and breast and the great thing about that is, my husband can do some feedings at night while I get a bit more sleep! I would not advise skipping pumping or breastfeeding him (and letting your husband feed at night) until you have had your milk supply up and running for a good 3 to 4 months. I tried it too early and had to reestablish my supply. Babies don't usually sleep through the night until say 4 months if you are lucky (we were not) and 6 months more likely (but we still are not at 6 1/2 months) so your body doesn't know to keep up your supply if you skip pumps at night while he gets a bottle before then (that is at least in my experience, but a LC consultant may say that is even too early to start dropping out pumps at night). I have gallons of breastmilk stored in freezer now because I established such a good supply early on, so just be diligent and you should be fine.
Stick with it, you have a great start at 6 days out now! If you need any resources on where to get pumps or the name of a good LC, you can email me and I'll give you the resources I have.
Best of luck!
S.