I don't wanna sound stupid..

Okay no negative comments please.
I drank last night and I didn't drink much but I got sick for the first time ever and have been sick all day today. I didn't mix and didn't drink fast or a lot. I've heard of people doing it and ended up being pregnant I did test before I drink always do and it was negative. My in law did the same thing and decided to test the next day and was very much pregnant! Anyone else expeirence this? My last af was 12/10.. Any advice is welcome!!