help please

hey guys! first post here, i'm worried I had cramping & bleeding at 4weeks with a threatened miscarriage, at 5 weeks we did a follow up & to our surprise baby was growing & healthy, even heard a heartbeat. I'm now currently 7w5 & this morning i had light bleeding But it was right after me & my husband had sex. Could the sex have brought on the bleeding? I just don't want to bring something up if it's normal and scare him. Any opinions help(: