We have never had bleeding occur after intercourse until now

Me and my boyfriend have been having sex for about a month now. Last week we had sex multiple times. However, we used the pull out method. This week we had sex again and I was lightly bleeding directly after intercourse. We have never had bleeding occur after intercourse until now. The day after (today) I experienced light red spotting/brown spotting. At first we thought it was just abrasion of some sort, but now I'm not quite as sure seeing it's still consisting. Not sure if this is relevant, but I believe I have a UTI as well.