Could I be pregnant...?

So I'm going to be quite specific, cause I want to know the exact answer based on everything..

I'm quite worried that I could be pregnant. Last week and I think the week before that also, my boyfriend and I had sex. But I'm not exactly too worried about those, since the condom didn't break and all. Is it bad to have reused the same condom though? Cause one of the times he had to pull out.. we decided to not continue. But we ended up doing so anyways, with the same condom.

What I am worried about though, is a few more weeks before when we had sex. We always mucked around. Two things I'm worried over about it - what's the risks of getting pregnant if we were I think it's called.. dry humping? I've searched around already and it says the chances of pregnancy happening from that is quite low, cause the precum sperm needs to travel through the clothes. But what if he wasn't wearing anything and all I wore was quite a thin undie. And I remember I was ontop of him one of the times, with his penis right at my hole. And another time he cummed from hj, while we were cleaning up he got some of his cum on his hands too. He was going to finger me right after it. But I stopped him cause I was scared of the cum on his fingers. His fingers were pretty much dried up already, but I was scared something could still be on it. I know sperm dies in air, but not until a while after. So I licked the places on his fingers.. then he fingered me. Could there be a chance from that?

My period usually comes around end of the month, though it ain't stable yet. But I haven't got it yet. It could be because of stress, since I'm in the middle of exams. But I searched up those pregnancy symptoms, and some of the symptoms was fatigue, nipples colour darker, areolas may enlarge and also higher temperature.

My friends say it's just because I'm paranoid so I think my areolas seem darker and wider than myself. I'm always very tired, so I'm not quite sure on that. Especially with the lack of sleep from studying lately.. which is probably why I'm tired. But I also get headaches a lot and dizziness time to time. But that usually always happen to me anyways, cause I lack iron. And body temperature higher, the entire day today and a bit of last night, I kept feeling like the blood rise feeling and body was quite hot. It could be just from the fact I haven't been getting enough sleep and not wearing enough when it was cold.. but I'm not sure.

My boyfriend and I are seriously stressing. Maybe we're just seriously paranoid.. but I don't know. I just wish my period can come now.. help anyone?!