pregnant from being fingered if the finger had semen on it.

about 5 days ago, i was with my boyfriend and what happened was, i gave him a blow job, he said there was already precum, so after that he did not cum but i probably had the precum on my hands- i do not remember if he wiped it off or not. 

during all of this i am on my period, it was the second or third to last day, an after the blow job, 15 to 20 minutes later, i changed my tampon, an just stuck my finger up, with the hand i gave the blow job with, i did not wash my hands (stupid me) but i do remember my hands were dry.

it then occured to me after i stuck my finger up, and i changed tampon what i just did, and it was like my brain went into panic mode, i washed my hands throughly, had a shower and washed up into my vagina for i was really really scared. i kept washing my hands really wel after, for i felt absolutely stupid for forgetting, because i ussually don't. 

the twist is, i do have cramps when i am on my period, but they settle down after first to second day, the day before i had a intense ab workout so i was a little sore, then the next day i went on a intense hike for the day, it didn't occur to me what happened about the blowjob, but at times i did get really worried. i still had my period until 2 days after the incident. 

i did read about something where it's really all in a persons head, that the brain creates these symptoms due to stress, and i feel it might be that. i do feel bloated- but i did  have a lot to eat this weekend, including cherry tomatoes which i know can upset your stomach and such. 

it has been 5 days after, and im just really concerned because i dont think im pregnant, but reading more and more relatable stories- it has me worried. 

i need to know if this is all in my head or if this is a possible situation of pregnancy....