Please help.

[Caaarol]

Could i be pregnant? I had my period on August 30th and finished on September 4th. On September 6th i had unprotected sex but im not quite sure if he actually *** inside me.  i felt like something hurt and i told him to get of me and he did but i don't know if he went inside of me or not and when i went to the restroom to pee when i wipe my self i saw blood and i asked him if he came and he said no... i then took a pregnancy test about a week after that day and it came out negative, then i had my regular period on September 29th through October 4th but then i was feeling my stomach kind of hard (i weight about 185) so i asked my mom and sister to feel it and they said it was fine! On January 12th i took another pregnancy test and it came out negative! I been having my periods when im supposed to and since i am a regular is easy for my p tracker my app to let me know when is my next period. And now on February 16th i had my period like normal but i feel my stomach strange like every time i touch it i feel like is hard on the top i haven't experience any sort of cravings ,morning sickness or stuff like that i don't know if im overhinking this and what im feeling is cause by stress or that im actually pregnant?