high risk pregnancy, ie over 40. do you avoid sex

feeling so guilty about my miscarriage last Dec. tried for 3 years to get pregnant. found out at 4.5 weeks. googled a lot about is it save to have sex while pregnant. everything I read said it was safe as baby is high up etc etc. after sex something felt different. by morning I was bleeding, Dr said inwas still pregnantbut I continued to bleed until I wasn't. later I googled high risk pregnancy and sex and it said it was dangerous. so disappointed in myself for risking it.