Changing values

So I’ve been in a relationship for 10 months and I love him to death. We have talked about having sex. It hasn’t happened yet because I would love to wait till marriage and I’m on birth control. But, I feel my values are changing kinda. Idk someone help. I just feel like I want it but, I don’t want to feel like I made a mistake. 🤦🏼‍♀️ if someone could give some advice that would be wonderful thank you!