Bleeding ?

Me
I've had very light cramps for the past few days, but today I started to bleed a little around 9pm.. It's a very light spotting that It's not noticeable on the pad yet, it's only noticeable when I wipe. I'm not due for my period until like 3 weeks. I've had sex around like 10 times. I recent lost my virginty in May, and I've been using the pull out method most of the times. The only time my SO came in me is when he had a condom on.. Could it just be my period coming early, or could it be something else?