Am I pregnant ???

So i am on the pill but not always accurate and do miss some days or take it late sometimes so it’s not accurate. My bf and i had unprotected sex about 13 days ago and he pulled out but not sure if it was in time 🙃 I noticed later in the week that the day we had sex would’ve been my ovulation day had i not been on the pill. i am worried bc since im not super on time with the pill. for about 4 days ive been having HORRIBLE food aversions gagging from the taste and smell of meat particularly chicken, dairy, and eggs. I love all of these foods and don’t normally have any problems eating. The thought of all foods makes me so queasy, i am cramping here and there, and my boobs hurt. i took a pregnancy test but its negative assuming its probably too early to tell. i’m supposed to start my brown pills and period in about 4 days but am so impatient i just need to know how possible pregnancy is considering its only been 13 days i surely wouldn’t show symptoms this early right ??? help !