Had a full 7 days on my period. Last day was a Thursday. Had sex Saturday night. Started spotting Monday n its still spotting going to be thrusday.. what does this mean?

No way to make a diagnosis online. It might be nothing. If the bleeding continues checking in with your doctor would definitely be a good idea. Have you been tested? For pregnancy or stds? If it was just this past Saturday that you had sex it would be too soon for a pregnancy test to be accurate. You'd have to wait a couple more weeks for an accurate test.

Typically it's left over blood from the uterus. Orgasm causes contractions, thus the blood is flushed out.