4 weeks pregnant contraction??

Hi, I just found out that I am pregnant after an early miscarriage in july.

Something weird happened, I had a braxton hicks contraction. This is my third child so I know for sure that’s what it is, I’m just wondering if it’s dangerous at this stage (4 weeks) or to just ignore them. I had it after an orgasm, so I’m wondering if I should stop all sexual activities? I will talk about it with my midwife, but I don’t have my appointment with her for a while still...