Some things to keep in mind:
Your son is 8 months old.... for the 1st year of life, breastmilk/formula is the primary source of nutrition for a baby. Not solids, Not water or juice. This is per our Pediatrician. For the 1st year of life, a baby is getting "building block" nutrients from the breastmilk/formula per development.
Sure, lots of Moms nurse while pregnant. Sometimes when nursing during pregnancy, the breastmilk changes in taste and supply. It's nature. Some babies will not nurse when this happens. But each baby is different.
Next, your OB/GYN may or may not tell you to stop. BUT, your baby is only 8 months old... so breastfeeding/formula is still very crucial.
Not all babies will self-wean when a Mom is pregnant. I nursed both my kids. I believe in letting a child self-wean. That is me. My eldest, my daughter, self-weaned when she was about 2.5 years old. During that time, I got pregnant once... but miscarried. But it was not due to my still breastfeeding during that time. However, my OB/GYN said to stop nursing when pregnant... because it causes contractions... and it can take away nutrients from the growing fetus. But, then again, a body "is supposed" to compensate...
You seem unsure of (1) still wanting to nurse until your baby is at least 1 year old or 18 months old and, (2) that "for us the timing is right..." to try and get pregnant now.
- my recommendation is, that you NEED to be sure of what you want. Because, all said and done.... suppose you do get pregnant now... but, you may or may not even be able to nurse your baby, who is currently only 8 months old. Lots of things can happen and change. THEN, you NEED TO think about how all of this (getting pregnant) will impact your baby, now...in light of how long you wish to nurse him ideally. AND what is also best for HIM, versus the "timing" of getting pregnant?
Yes, trying to conceive can take time. It's not always a slam dunk. So, perhaps wait another 4 months before trying... and by then your baby will be 12 months old... and maybe this will be more palatable for you and him to "wean" if that is what you want?
I know, lots to think about. If that were me... I'd wait until my baby was at least 12 months old, before trying or getting pregnant. But that is just me. And mind you, I am not "young."
All the best in your decision,
Susan