It could be lightening.. when the baby's head is descending into your pelvis more, and when he/she moves it can almost feel paralyzing in your va-jj. Sometimes I feel like my son is going to stick his arm through my cervix, feels like a stabbing knife coming out my lady parts. It almost takes me to the floor it hurts so bad
From what you described, it sounds like cervical spasms which is normal. I got those around 35 weeks as well with my first, it kind of felt like a quick shock down there. My gyno told me its my cervix preparing itself for dilation. It could be weeks of it though.