Fat arm pits

I'm 29 weeks and I just started noticing my under arm getting fatter and my breast are really starting to leak colostrum! This morning I can barely lift up my arms or put a bra on. I feel under my arm and it's so hard and sore! Does anyone else have this problem?! (I did breastfeed my first born and I plan on breastfeeding my second as well) it's irritating that I can't wear tank tops and strapless dresses bc it looks like I have 4 boobs 😭😂