Yes that happened to me recently.

Firstly are you on the pill? If you are and not taking it everyday or at the same time everyday then that can cause spotting/bleeding.

I had an abnormal pap smear result and my doctor thinks that was the cause of my spotting. Anyway to cut a long story short, it was nothing sinister (a benign growth and very tiny) but I did get it lasered off by my OB. I am now on six monthly pap smears to keep an eye on things down there.

Please try not to worry (I know easier said than done!). Its a good sign that your doc didn't see anything abnormal during your smear. Can you ask for your results to be treated urgently? My doc was fantastic as she knew I would worry and I got my results really quickly and then saw my OB only a few days later to get it sorted. Best of luck x