So I wet myself...

So. Here's the thing. I really had to pee today. But I held it in for a good two hours till I got to campus. Sometimes when I hold it in for long I went myself a little. This was the case when I went to the bathroom, but this time a saw a little bit of red. I've been doing research. I'm hoping this red is cause I held it in for too long, but then again, I did have sex without a condom twice. First one I got my period a week or so later, but it felt different. Lighter than usual but bloody enough for me to be like okay. And now I'm just waiting on my next period. I'm hoping this isn't like a symptom of pregnancy. I put on a pad for the next time I use the restroom to see if there's blood. Any words of advice..? I'm about to ask my BF to get plan B. Because I am a bit worried.