Could i still be pregnant

Erica
My period is suppose to come on this Saturday but I'm unsure. I was ovulating on the 28 of last month which was a 22% chance of pregnancy we had unprotected sex on the 29 which was only an 8% chance of pregnancy I took the first response test 6 day sooner and they both came out negative ladies what should I do was it to early to test or is it just in my head