3 weeks ago my boyfriend and I had sex, the first 10-15 minutes was unprotected then he decided that before it went any further it'd be a good idea to actually put a condom on, I had finished my period a few days beforehand, he didn't ejaculate near me, the last time he had ejaculated was probably either that morning or the day before. My period is due in 14 days but this morning I started bleeding, my period is never early, it's normally late and I noticed that it's quite light and it's actually not the same colour.. is there a chance I could be pregnant? I am 15 and he will be 17 in may.