Might be pregnant?

So my period usually comes around the 8th of each month. Well I haven't had my period this month. Me and my boyfriend are sexally active, but im not on birth control and he doesn't use a condom. He does the pull out method. Im scared I might be pregnant. I've been gaining a little weight in my stomach and my breast have been really sore the past week. So I'm not sure if my period is really late or if I might be pregnant.