I would go ahead and call your doctor. Mania could ruin your trip, so if it were me I would want to have a plan in place in case the hypomania increases. I would ask for a med adjustment that I could use in case and then wait to see if it is needed. If so, you already have your meds with you. If not, you were prepared. I think that is better than doing nothing and potentially ending up IP while you are out of town. This is a special trip for your kids and husband as well, so it makes sense to do all you can to ensure it is a good time for everyone.