Braxton hicks?

I'm a FTM at 28+1 weeks. I had my first contraction the night before last and then again yesterday morning. It wasn't painful just felt like a lot of pressure and my belly was rock hard. I emailed my doctor and he didn't help much, just said I could go to the hospital if I felt that it was getting bad. Today I had another contraction but this time it was very painful. I'm not currently working but I'll admit I have been overdoing it as of lately with household chores and family outings that required lots of walking in the heat. I don't want to cry wolf and waste everyone's time but I also don't want to hurt the babies by ignoring signs. I feel like I might just be freaking out for no reason.