I Had Unprotected Sex While I Was Fertile (as Planned).

I had unprotected sex while I was fertile (as planned). I got my period 10days early when my periods are always consistent and on-time. My period lasted the normal 5-6 days; cramping, lower back pains, one day of nausea, headaches, body fatique all over. I am worried that I could be pregnant but b/c I got my period, I am doubtful. What do you recommend is happening or has happened?