Am I pregnant??

Lately I’ve been very moody and I’ve really been craving chocolate and I’ve been very tired I’ve been getting nauseous and I’ve had a headache for weeks now and today I started cramping in my lower stomach kinda like where period cramps would be. I just ended my period last week so I know it can’t be that. My fiancé and I had unprotected sex but he doesn’t remember if he came in me or not. I think that was on Christmas. And I read it does take up to 4/5 weeks to show signs.

I could just be overthinking but idk.

I’m not worried if I am pregnant I just want to know if it might just be in my head or if I should go buy a pregnancy test.