Ladies, I need your help!

I think I just had another contraction (I had one a few days ago according to my doctor). I was walking and got a super sharp pain on my lower left, it made me drop, almost to the floor. I thought baby just hit a nerve until it didn't go away and then it started on the right side. I couldn't tell if my stomach was tightening because I was so focused on the pain. It made me tear up even. It lasted maybe 90 seconds. I am 35 weeks and kind of scared.