Acne/strange bumps in weird place?!

I have these weird bumps under my boobs. I am 24 and have never had this happen before. There are a few on my belly but it is worse right under my boobs. Has anybody ever had this happen before? I am adamant about cleaning my clothes / making sure my bras and sports bras are clean. I shower directly after each workout. I am 7dpo and I am curious if it could have anything to do with a change in hormones? My boobs are swollen and painful. There is a huge chance that I could be pregnant but these bumps are aggravating me.

They do not itch and they are not painful.