Hello, C.! 1st off - Congratulations! Believe me when I say this discomfort will pass. I know from experience. My 1st baby, I had back labor pains for the last month and he was 10 days late (only about 3 according to my calculation). So, as soon as my water broke, I went in requesting my epidural. Of course, with check-in and paperwork and blah, blah, blah, it took longer than I wanted. But, as soon as it took effect, the rest was easy. When I finally felt like it was time, only the nurse was in the room, and we did two "practice" pushes. Then, the doctor came in, and he was barely in place for my last push.
Then, for my 2nd, she was breech, so I had her by C-section.
Now, I am 34 weeks, and I have people asking me if I'm having twins this baby is so big. At my last sono, they said she was about 5 something pounds, and others at this stage are about 3 pounds. And the sono tech was saying "Wow, this is a big baby". So, in a week I have another sono, and then after that they will do another sono every week. Yes, there are complications, I'll be 39 when the baby is born, and I'm considered in the obese category, but I've only classified myself as overweight. Anyway, I understand about the discomfort with this one as well, b/c my feet and ankles are so swollen, I only have one pair of shoes that I can wear, and they are sandals with buckles and they are on their last notch, and I have to wear these once most comfortable sandals with everything including my Sunday dresses. And, by the end of the day, even these shoes are too tight, and my ankles are so swollen, that basically I can't bend them walking up the stairs in our house, b/c there's too much skin and excess that there's no give. And, it hurts.
Anyway, sorry to go on so much when I was trying to be encouraging, and say that having kids are a great blessing, even though sometimes we might be blinded by other factors, but we just have to keep our eyes on the blessings ahead.
You are doing well, and later it won't matter that you didn't know in advance how much your baby weighs. What matters is that you enjoy your baby and the love and support from your toddler and husband.