My period is irregular, but my boyfriend and I fooled around yesterday and I’m late. Am I pregnant?

For starters, your delayed period is much more likely due to your irregular schedule than pregnancy. Second, if the accident just happened yesterday there is zero possibility that it is the cause of your delayed period (or pregnancy). This is because even if there WERE a chance of pregnancy – meaning sperm made its way into your vagina – it would still take DAYS for the sperm to reach an egg, fertilize the egg and implant into the wall of the uterus.

Regardless, birth control might be a good idea for you for a couple of reasons! First, to regulate your periods. Second, to protect you in case more intimacy happens with your partner.