Completely normal. Orgasm can cause slight contractions, but unless they continue & increase in frequency & strength, you're fine.
Not contractions. Not sure exactly what it was but when I was 14 weeks And had sex my lower belly would get really hard and tight feeling.
Your cervix and uterus are actually very sensitive due to your hormone levels. But from what I've read and experienced it is normal to experience some cramping after sex. Organisms cause a raise if hormones that actually cause your uterus to contract slightly. As long as it goes away shortly after with no bleeding or discharge you should be fine. But to be safe always check with your Dr.
Your uterus is contracting bc you had an orgasm..it does that after sex bc orgasms trigger your uterus into contracting..completely normal though as long as they aren't timable or extremely painful. Plus cemen makes you cramp too