bfn and sensitive swollen nipples

I posted on here earlier about having sensitive and swollen nipples asking if anyone else had this as an early sign of pregnancy. Boobs are fine it's just the nipples. I also tested today and got a bfn. This app is telling my I ovulate today but my periods are irregular and I think I might have ovulated 5 days ago. 
Basically my question is- if I did ovulate 5 days ago is sensitive and swollen nipples a sign of pregnancy or would t be too early to get any signs? I also have been finding myself taking a nap the last 3 days.