Achy & migranes 1 week after unprotected sex?

Megan

I feel like crap. My head hurts, my muscles hurt, my throat is sore, I'm getting chills. .

I had unprotected sex a week ago, and he pulled out, and I had my period two days later (it just ended).

Am I just being paranoid and just have a fever/the flu or could I be pregnant?