Could this be possible pregnancy?

I've had protected sex with my boyfriend quite a few times since my last period, but on occasion I let him in without a condom, a couple pumps, but we stop and get a condom so we've never done the pull out method in full. But there has been precum which I know is enough to get pregnant. About a week and a half before my period I had some spotting. Like a blood clot, if I remember correctly. I started what seems to be an extremely light period yesterday. It's so light I don't even need a tampon. I'm having cramps, headaches, and am emotional, but nothing else.I took a pregnancy test today and it was negative, but I just do not feel at ease because of my light period. I can't afford to go to a gyno, I have no insurance. And the waiting to test again is killing me. Any advice or similar stories would be very much appreciated.