Help?

Okay so I had unprotected sex a week ago., and in my fertile window. We used the 'pull out' method, and I'm aware that precum can impregnate you. What can be the earliest possible symptoms?

Currently I've been experiencing:

-nausea

-headaches

-slight cramping pain in my abdomen and pelvis

Help?

I'm just curious, and I'm not trying, but I'm not preventing either 🙂