Possibly pregnant?

Okay, so the last time I had sex was around July 12th and haven't had any since and it's currently October 1st. I've had 3 normal periods since then but I've noticed that my discharge went from normal to a cottage cheese like substance and then clear, also I've had like one or two times where there's sharp pain. I just finished my 3rd period but notice my stomach was relatively a little bit bigger than usual. Mind you, my periods last for 7 days with really heavy bleeding and cramping. I want to take a test but can't exactly do it atm. I've also started up sports (I'm a teen) and I talked to one other friend who is saying I'm just bloating still from my period.