Can you have sex in first trimester?

Emma • Was trying for 7. months. And on the 19th jan we had our baby boy.
How long after finding out your pregnant did you have sex?  We are having a bit of a ban on sex untill we let the little poppy seed settle in. Lol. Just that I heard that sex can cause miscarriage in very early days of pregnacy. But wanted everyone's thoughts on this!