bleeding during intercourse

so i've had sex a whooping two times, and obviously the first time you bleed because the hymen breaks but the second time i bled (very little, brownish red blood) again and i'm not quite sure why. i decided to feel around to find my "g-spot" earlier today and once i kinda found it and stuff i started bleeding (very little, more like spotting) again. could anyone tell me what this is? i know i don't have an STD & that's what the internet says but its impossible because it was the same guy and it was both of our first time. i'm not quite sure what to think and am kinda stressing out about it because i don't want it to ruin sex.