Losing my virginity at 16

So yesterday i lost my virginity to my boyfriend and it was unprotected. we had sex the first days of me ovulating. We both did not ejaculate but it was still enjoyable. My boyfriend complained after that his dick kept getting dry so I do not think pre-cum was involved. After we had sex I've noticed I have brown discharge and a little stomach pain but that is also associated with ovulation. Should I be worried? I'm so scared and nervous. What are the chances that i COULD be pregnant. (This is all from yesterday and today)