Single red bump on the pubic region of my vagina?

Yesterday I shaved my entire pubic region and today while I was using the restroom I noticed a single red bump with a white head on it, like a pimple. It wasn't on my vagina it was where the hair grows right above it. So I popped it, and there really wasn't anything that came out just the white head came off. There's no itching and I am pretty sure I don't have any diseases because I am pregnant and was tested during my first trimester. but is this normal? What could it be?