4WDing

I'm almost 7wks and we're on holidays at the moment. My hubby is hanging out to go 4wding today, but ive just read mixed comments on whether it's okay. Does anyone know or have any experience? I haven't seen the obgyn yet this pregnancy, so I haven't been able to ask any questions. Note: we'll also have a 2yo and 4yo in the car so we won't be going over any crazy tracks