I wanna know this

Ok so.. my boyfriend was masturbating and all, and after he ejaculated (the sperm got on his fingers), he fingered me. But the thing is, after he came, he wiped everything off with some tissues and waited a few seconds before actually fingering me. The day right after, my period came which was weird since it wasn't due till the week after, and because I hadn't had any fatigue, or cramps (except a few days earlier while I was jogging), etc. I think it came earlier because of the huge amount of stress I've been going through, but my boyfriend thinks it might be the type of bleeding pregnant women get right before the baby starts to form. The day right after my period, while I was working out, I got nauseous and got a headache. The day after that, I got sick, which I think is the reason to the working out thing, but my boyfriend is worried I might be pregnant.

Could I be pregnant?