Ooouch!!!!!

So tomorrow I’ll be 30 weeks. The last few weeks I’ve had off and on “cramping” feeling around my bellybutton. It would last a few minutes at a time. I chalked it up to just my belly stretching and growing. But today the left side of my bellybutton has been hurting like a constant cramp/bruise feeling from the time I woke up to well into the evening. Has not really quit and it’s bothersome. I have an appointment in two days so I’ll ask my Doc then. But have any of you ladies experienced this? I heard it could be a naval hernia? Or could just be growing pains?