Early pregnancy symptoms.

I wanted to know if anyone had any pregnancy symptoms before their expected period. I've been having on and off headaches, Lower tummy cramping occasionally, and last night/ early this morning. I started feeling REALLY nauseous almost to the point where I feel I was going to throw up. 😩 I'm getting worried cause I never go through any of this before my period. Except cramping. But not this light and early. I did have unprotected sex around my fertile days so the possibility of being pregnant is very high.