i had my period but am i still pregnant? plzz reply =[

I had my period the day i was supposed to and everything but the only problem is it started out really light and was a dark brown. it gets a little heavier the farther it goes but im scared that its just gonna be spotting. I havent had unprotected sex. What happend was me and my bf got too into the moment and got too carried away and i put it in for not even a second. But then it got yanked back out cuz we noticed we had no condom. But that was IT. PPL are sayin u can and that u CANT get pregnant from this but i dont know
but if i've had my period on time should i be ok??
It was 3 weeks ago. I've had no sick feelings and my boobs arent sore. I took a test last wednesday and it was neg. ((it had been 2weeks then))
but should i be lookin at a positive side that im NOT pregnant or is this a bad sign that i AM pregnant?