15 BH in an hour?

I've been having some serious Braxton hicks today. It started when I was supposed to go to a family party. I showed up, started feeling really achy, and cried because I just wanted to be home. My husband took me home and since then I've been timing them. I've had 15 in an hour. They're not getting more intense, just very uncomfortable. I feel it a bit in my back too. I've been drinking water all day and trying to rest now. I did have sex today, so I thought the BH were bc of that at first, but it's just been alarming at how often they're coming and not easing up any. I called the doctor and she said to come in if I feel the need to, but I've just been resting to see what happens. What would you do? I'm 29 weeks.