Is it me or possibly my birth control?

Earlier this year I recently began to become sexually active. At first my boyfriend and I used the KY Jelly warming lubricant but it would always leave my vagina on fire. (I pee immediately after sex to help avoid UTIs and so on) I googled why that may be but I was different from the other cases. I ONLY burned after the fact. Then I began to google some more and found that being too dry or maybe too tight during sex can cause microtears in the vagina hence my burning when I would pee. I stopped using the lubricant and told my boyfriend he'd just have to make a greater effort with foreplay to avoid this and it worked for a few times. But today we had sex. It was a little tight and painful at first but after a while it was great. But when I went to pee it was the worst burning sensation I've ever endured after sex. I even spotted as well. I ran cold water and occasionally rubbed ice on it until the burning was gone.