I experienced e same too and had e menses cramp feeling for weeks, my previous gynae sent me for emergency detailed scan but found nothing. He said most likely is my body is yet to get use to pregnancy.. like what he always said “before u preg u are a girl, so u hv to give time to your body to slowly adapt”
If u spot any discharge better to consult dr soon. And please remember to inform your dr about ur cramp just be safe.