I Am 18 Years Old About To Turn 19 In

I am 18 years old about to turn 19 in August me and my boyfriend just recently had a slip up and he thinks he got me pregnant I was waiting until my cycle came on and it is late but today I have been bleeding lightly which is not normal my flow in the beginning is heavy but this is not and there is no blood in my urine but some on my pad enough to fill just the middle it’s not a lot but when I wipe it’s enoygh to fill the tissue help idk what’s going on could it be something else ?