Cramping after sex is normal as long as it's not extreme. Sperm contains prostaglandins which causes the uterus to contract. But it won't make you go into labor unless your body is ready. Yes call the doc next time just to be safe. If you are spotting they will more than likely tell you to go to labor and delivery to be checked.
Thank you. Yeah I've had cramping before after..ill call the doc next time.
Your cervix is very sensitive during pregnancy. Some spotting is normal as long as it's not a huge amount. But if you start having cramping or your bag of waters breaks call your doctor immediately and go to the ER. Good Luck.