J.,
That is a very tough question. Every pregnancy is different. And I totally mean that. With my son, I started having contractions on Friday night (after taking my MIL out for her birthday). They were not consistant and not getting worse. So when we got home I took a shower and they went away (braxton hicks). On Monday night the same thing happened, execpt this time they were evenly spaced and were more severe. I called the doctor who told me to go in and be checked out (especially since this was my first and I had no idea what I was supposed to feel). Well, after midnight I was sent home with them saying Braxton Hicks again. On Wednesday morning (around 9am) I was having contractions that started out very lightly from my back to my front and would go away. They progressively got worse and closer together. I called the doctor and they said get to the hospital. So I get there around 11am and I am dialated to a 2. My little boy was not due for another month, but according to the last measurments he was big enough to continue. My doctor said that if I had not progressed at the end of his business day he would send me home on bedrest until my son was born! I didn't want that. When my doctor came back I was at 2 1/2. He broke my water, I had an epidural and at 8:23pm my little boy was born. Yes I would have rather been at home for most of that, but I didn't know.
So with my second, I knew what I was up against and I knew how long it could take (or so I thought)....On Monday evening I went to the bathroom and a few minutes later my panties were wet. I thought my water had "sprung a leak" so I called the doctor who sent me in. I was having braxton hicks contractions and had only lost my mucus plug. So they sent me home with recomendations to be in bed the next day. Mainly because it was so late (early in the morning) when we left the hospital. But the nurse said it was up to me and how I felt. So I went to work (didn't have to be there until noon). I felt great all day and even mopped my infant room floor (worked in a daycare). Went home played with my son, made dinner, slept GREAT! The next morning (Wednesday), I woke up (at 7am) with severe cramps like I had to have a BM. So I went and boy did I go...BUT the cramping (in my stomach) did not stop. I tried to go again, but nothing. My son woke up and wanted to read. It got so painful I could not read outloud to him, so I called my hubby to come home from work and get me. We needed to go to the hospital NOW! I called my doctors office but it was about 7:30am and I had to wait for the answering service to answer. Everytime they would get on the line I would have a contraction and could not talk so they would hang up! I tried this several times, but never spoke to anyone. By 8am my hubby was still not home so I called my boss for a ride. My hubby walked in the door just as I got off the phone with her, so hubby called her back and said he was home. He got our son in the car, and I was on my way out. My water completly broke just as I got to the car. It was January 31st and COLD, and now I was wet! He sped (as fast as you can go on I-30 just after 8am) to the hospital. Passed me off to an ER attendant who wheeled me up to L&D, while hubby parked the car. He got to the room as I was pushing (without my doctor, in my street clothes minus the bottoms, and 3 nursed to hold my feet and hands). They sent my hubby out of the room to stay with our son as we had not had time to drop him off with granny. My daughter was born right as my doctor came RUNNING into the room. He cut her cord. She was born at 8:58am (less than 2 hours of labor, no drugs, no epidural, no episiotomy, no nothing)!
All of that to say, no one can tell you when to go to the hospital. It is all your best judgment and who knows if you will have an 11 1/2 hour labor or less than 2 hours. Congratulations on your second and I hope it all goes well.