Pink discharge after sex

I had sex the day after my period ended and right after I had some light pink discharge and just a little this morning after I showered. I have had sex recently and it has not happened before. I’m thinking it is just some leftover blood from my period ending since sometimes it’ll stop a day and then be light one more day and that it was a bit rough and deep especially in doggie and he hit my cervix hard a few times. Is this normal since it hasn’t happened before even tho I have sex regularly and I have never had any other symptoms?