i had sex almost three weeks ago, he precame in me and pulled out. i havent been having any pregnancy symptoms that i know of, i have just been gassy. my period is due for this week through next week. is there any chance i may be pregnant. i took two home tests and they both were negative, is it too early to detect anything. my last period was on feb. 16, its irregular., it usually comes at the end of the month.