Okay so this is long, and probably sounds really outragious but i'm a paranoid person...

My boyfriend and I of almost 4 years don't have sex but we do of course "mess" around.
I can't really remember the sequence of events it was almost a month ago but I know he didn't cum until towards the end when I was giving him a hand job and he was fingering me. It did go all over the place ha but after we were done we washed our hands. We think we wiped it all up but in case we laid down a towel that was semi damp. If I laid down on it by accient and I was still wet is there any way I could get pregnant? Or if the tip of his penis touched the outer edge of my vagina for barely a second before he came?

The reason i'm asking is because I have what I think are normal periods. I usually have 2 days of bright red blood followed by about 4 or 5 days of old brown blood that is fairly light. Just last week I ended what I thought was my period. However I only had 1 day of red blood followed by 5 days of old brown blood. It was light, but I didn't really think anything about it I started reading all these stories about implantaion bleeding, and women thinking they had their period when really they were pregnant.

I also am very bloated right now too which usually goes away once my period starts.

Could these be signs of a possible pregnancy? I really don't want it to be i'm 22 but we didn't have sex.

Does my last period sound like it is a period or early pregnancy bleeding?
What are the odds of becoming pregnant by fingering or sperm going through clothes?
How long does sperm live in a moist environment, like a warm leg or something?

Sorry these all sound so elementary, but like I said, i'm a paranoid person, and there is SO much stuff on the internet I need help sorting it out...

thank you for anyone who can help!