Ok ladies

I need some help! I'm 33 weeks measuring 2 weeks ahead and the last 2 night after an orgasm I have had contractions. The first night i happened wasn't that bad painful yet bearable and only lasted a few short minutes. Then last night happened again this time they stopped me dead in my tracks hurt so damn bad and lasted for 10+ mins and we're pretty back to back. And today my lower belly is sore from the contractions. So what does this mean? This never happened with my first so I'm in the dark here..