My boyfriend told his mother...

So my bf and I have been together almost 2 years (one month away) and around my birthday a few months ago we decided that we wanted to start having sex. Always with a condom, and he would pull out too. We’ve only had sex 4 times and his mom asked him today if we had done anything. He told her about t and although she swears she won’t tell my parents I’m not so sure. My parents are VERY religious, and my grandfather is the pastor of our church. If they found out that I was having sex I would be dead. Any advice?