Too soon?

Kayla

I took femara 5 mg this cycle. I had a positive opk on day 14. My nipples have been sore/sensitive and erect since. I’m currently on day 18 and have to get progesterone blood work on Saturday. Anyone else have these symptoms with fertility meds? I hear sore breasts are a sign of pregnancy but I feel like it’s too soon for that, though I’m hopeful.