menstrual like cramps ?

Anybody having menstrual like cramps around this time? I'm 33 weeks & 2 days. 
If you did/do have them was it just normal stretching etc (body preparing for labor),  a UTI, or possibly pre-term labor??? Or something else?? 
Also **TMI*** but hubby and I had sex last night in a different position than normal, could that have caused them? 
& No I have not yet called my doctor, it's not excruciating but more annoying even with Tylenol... baby girl is still moving like crazy too. 

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