Unsure what this could be

So I had my period a couple weeks ago which was normal then a few days after I had brown/red light bleeding which lasted about 4 days. I am on birth control but I’m not the best at taking it, and my boyfriend and I don’t use protection with my cumming in me a couple times over the last few weeks. My discharge over the last few days has been quite different to what it is usually with it being slightly pink some days and then others slightly brown and others very goey and white (tmi I’m so sorry lol) could be completely normal but just thought I’d see people’s thoughts, also due to the fact that I have been having some symptoms which wouldn’t really make sense to be PMS related as I just had my period. Thanks heaps!!! x