Faint brown discharge with stringy bits
I had not had sex since August, and I had a normal period on time in September. My period is due in a couple of days, and I had sex a few days ago, unprotected but my boyfriend did not ejaculate inside me. He never has. We did not have sex between August and a few days ago (long distance relationship). The day after I had sex with him, I thought my period was starting, and I expected it, but it was only a little very light brown stain on the paper when I wiped. That was yesterday. Today I noticed small bits of brownish stringy stuff. It looks a little like the dark clotty bits that are normally in my period, only smaller and sort of shriveled.
I very seriously doubt that I am pregnant, as my boyfriend and I are very careful when we have intercourse, but I have never had a discharge like this before. I feel very much like I normally do before a period, and I have no breast tenderness. Is this possibly a shedding of old blood left from my last period brought on by intercourse? There is no pain, no smell, and no burning or itching, and I feel fine. I have, however, been stressed out lately because of my college midterms. Anyone have an opinion? I intend to wait a few days to make sure I get my period but I would like to rule out pregnancy completely even though I know it is highly unlikely.
Thank you for your comments!