Ok. So I had intercourse about a month and a half ago and afterwards everything was fine. But 2 weeks later I started spotting which was very similar to implantation bleeding. Then 2 weeks later I got my period and I was relieved although it only lasted 2 days. Then I had intercourse again and a couple of days later I started getting itchy down there and it started to slightly burn when I went pee. Then I got my next period but it came maybe 1 week later and it s lasting longer than ususal  but it s only been one more day so far and before I got it, I was spotting again, maybe a couple of days before I got it. My symptoms are similar to a uti but I don t have to urinate frequently although it feels like a utilize when I do go and only a little bit comes out. Could I have an std? Or maybe my pH is just unbalanced from me having intercourse? I don t know what s wrong with me. Help please.