It is probably just too rough. When pregnant ur cervix gets bigger due to extra blood flow and hitting the cervix during sex can rupture blood vessels. As long as you are not bleeding bright red you should be fine!
Yes, very normal. Internal exams, sex, stuff like that can cause spotting because your cervix is more sensitive during pregnancy, cramping is also normal because your uterus contracts after an orgasm, it's nothing to worry about unless the cramps are severe or you're bleeding heavily.
Yeah it's not severe at all