What is implantation bleeding like?

Hi ladies, I was wondering what implantation bleeding is like. I barley remember if I had it before I got pregnant with our daughter 7 months ago. Me and my husband had unprotected sex ( no condom, and no BC because I recently switched so it's not in my system yet) on the 17 but he pulled out ( there was still prcum though tmi). Well this morning I had bright red blood when i wiped when I woke up. but it wasent in my underwear. My husband was wondering if it could be implantation bleeding because when we were trying for our daughter we read something about it.