Ovulated late?

Hello all!! I currently have a 4 month old! The app says that I ovulated on the 12th is this month. Well my cervical mucus was very slimy on Valentine’s Day and a couple of days afterwards. Me and my SO did have unprotected sex on the 14th. I took a pregnancy test today and it said negative. My period isn’t due until Sunday. Is there any way I could be pregnant? HELPP

UPDATE: still haven’t started my period and I was supposed to start yesterday!! Every time I pee though, it’s like nasty snotty discharge. So idk what is going on!!