FTM contraction or what? 🤔

Sara

So today I woke up on a very sharp pain in my left lower side only that felt like period cramps! It was only on one side and it lasted for maybe a minute I’m not sure🤷🏻‍♀️ cause I was in so much pain to tell

Anyways is this a contraction? Or what? And is it normal to be on one side and to happen just once? I woke up then with a mild lower back pain I’m 35 weeks btw