Your cervix is very sensitive during pregnancy light spotting. And a pinkish discharge are normal after sex and internal scans. If this continues for more than 24-48 hours after the act or there is heavy bleeding or brownish blood see a doctor ASAP. They will just make appointment with a midwife for a scan to see baby okay. I had same from weeks 6-12 and it can continue till well into 3rd trimester with some people. Nothing to be scared of at the moment though xx
If it continues and/or gets worse def call your dr or go in. It should be ok though if its a little bit and your not having pain. Cramping is normal as well after having sex. I always suggest calling your dr just to make sure cause you never know each person and pregnancy is dif.