So, I Had My Period On The 24th Of June

So, I had my period on the 24th of June and ended on the 28th, a few days later (I believe in July 1), I had protected sex with my boyfriend, everything went well. A week later, my boyfriend and I were just playing around (we had clothes on) and he ejaculated on my thigh without us knowing until I accidentally touched the area. I wiped the semen off with a towel, then I washed my hands just in case if there were any sperm left. A few hours later, my boyfriend dropped me off so I could go home and I washed my hands again. I decided to touch my clitoris but nowhere near the entrance. This is the part that concerns me the most.. Last night, I had to use the bathroom and after I finished, I wiped. I saw pink spotting with a tiny bit of blood, later it turned into a dark brown discharge, it didn't look like spotting at all and thought I'd get my period early, but there was no heavy bleeding. (My period usually starts at the end of every month) Now, its just brown spotting and I did notice some blood but its gone now.
Should I be worried that there is a chance I might be pregnant or am I stressing out?