From my understanding it happens around 7-8 weeks pregnant, but everyone varies. This is something I'm not looking forward to. I'm a tiny woman, but my boobs aren't tiny. My back is going to kill me even more if my boobs get bigger due to I'm weighing in at 115 lbs and my boobs are 34D. (
I'm normally a 32b but I'd put on a bit of weight in the last few months anyway (I'm normally a UK 8-10 but am now a 10) and my bras were feeling a bit small last cycle. I went to buy some new ones yesterday and am shocked to now be wearing a 34C! I only got my early BFP friday and wouldn't be due on until at least Tuesday.
This is my 2nd and I noticed my bb's were bigger almost in the first couple of weeks. They fluctuate (usually bigger at night) but now they seem to be dropping off a bit. With my first I don't think I noticed my breasts were much bigger until probably 8 or 9 weeks in. I think it varies quite a bit from woman to woman. I do remember though when my milk finally came in after the baby was born they grew insanely HUGE and hard.
I'm only a 36A and mine are a bit bigger but I'm still in the same bra's. With my last two pregnancies my boobs never really got properly bigger until my milk came in after having them and then (since I bottlefeed) they go down pretty quick back to normal.
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