16 weeks pregnant and I've been getting these pains I've googled it and it's described at "lightning…

16 weeks pregnant and I've been getting these pains I've googled it and it's described at "lightning crotch" weird I know.. but it comes like 2 times a day for just a few minutes... anyone else experience this? I mean I just had a ultrasound yesterday and everything looked fine but just wondering about this going on...