Brown spotting??

Has anyone else ever noticed off and on brown spotting? It comes at random times sometimes after doing the deed sometimes in the middle of the day. And it's only when I wipe. And only a few times. Then it will stop for a few days then come back. We've been ttc for over 3 years I'm not sure if it has anything to do with me maybe being pregnant but I've noticed it this month which is weird. I want it to be good news. But I'm not sure what it could be. Any opinions can help! Thanks in advanced!