Im having a lit period, could I still be pego

I need your help. Amost a month ago my husbanf and I had sex. The next day I was clean8ng the room to find that he just through the condom in the floor. O pick it up to throw it away when I notice that it was empty and there was a hole in it. 4 weeks later today I have started my period on time, but it is lite. With me my period have always been very heavy so lite is not normal. Could I be pego?