I need advice

Im 30 weeks pregnant and recently I’ve been having a lot of cramping and pain around my belly button is this normal? I know to go to my doctor and all that but I was wondering if anyone here has experience that and if it was something serious. Sometimes I have some really bad pain on my bottom right side or in my vagina but it goes away. Sometimes it does feel super painful though. I did recently started working again but just for a few days..should I just stop working over all?