Lump in breast need help!!

I’m 21 and I’ve been on letrozole (femara) a fertility medicine. I’m on my second month and a few days ago I found a lump in my breast and I freaked out.

Btw I’m in my tww.

I called my doctor for a appointment but haven’t called me back. My question is have you ever got lumps before a BFP or a period?