Am I pregnant ??

Okay so I’m 21 years old , I’m not on any kind of birth control. 2 months ago my period was 2 weeks late and it was only for 3 days and light Last month it was over a week late and for 3 days. Now I’m on my week of ovulation started having cramps and nausea 2 days before ovulation and the day before ovulating , I had unprotected sex but I started bleeding a little. Now it’s 2 days later and I’ve been having cramps still and today I have a little spotting . My period isn’t due for another 13 more days. Can anyone explain??