Can I still have sex?

On Thursday I went to my prenatal appointment my doctor did the membrane strip because I was almost 3 centimeters dilated and about 70% effaced. That night I had sex and afterwards I had a little bit of bloody discharge and some discharge that looked like the "egg white" discharge. I don't know if that was some of my mucus plug or not. Since then I have not had any discharge or anything else happen. Is it safe to have sex? My boyfriend thinks I lost my mucus plug and doesn't want to have sex because he read it wasn't safe. I thought the only time you couldn't is if your water breaks or your doctor says no.