Should i be worried about what my boyfriend told me?

Try not to panic, and try not to jump to conclusions too quickly. You just got big news and you have legitimate concerns. Now is the time to be honest with each other... without getting heated, confide in each other about your worries and thoughts. It's not doing either one of you good for him to deny any possibility of experimenting, if he is unsure of that himself. Work through your confusion together, and you will become stronger as a couple. Good luck.