Pregnancy or PMS?

Im 23 years old and not on birth control. I have never had sex. My last period began Dec 23rd. On January 1st or 2nd I was messing around with my bf and he fingered me several times. He had his underwear off, but mine were one. I noticed he had some pre-cum, but he doesnt remember touching himself before fingering me. Sorry if this sounds stupid. Anyway, last night I noticed a bit of red blood when wiping so i thought i had started my period. I've been very emotional the past few days so that made sense. I woke up today and have been cramping all day, but no more bleeding. I have never spotted before but am under a lot of new job stress too. Also today I was constipated, felt a little numbness in my hand and had indigestion. I know these can be pms symptons but i usually dont have cramps until day one of my period. I dont know how long my cycle is. I took an early pregnancy test today that was negative. I'm so worried. Can someone please help? please?