Just...weird. Help me

Please no mean comments. Take into account that I tried to educate myself and that's why I avoided intercourse altogether, but the more I read the less I understand. So please, help me.

So I started my period two days ago, and it was medium-heavy, and today it just stopped! I still have cramps but yhe flow is gone. Can I be pregnant? I didn't have intercourse but he fingered me and I don't know if he had precum in his fingers. I read that it can have sperm, but others say that it doesn't, and even if it did that the trasspasing makes it almost impossible. Bf says it is okay, that there is no chance, but I'm kinda nervous. I tend to have periods of 5 or 6 days. Reasons why it may have stopped like this? I've been under a lot of stress, and eating rather poorly. I can't buy a test until Monday at least.

Please help me