Weird pain in vaginal area

This morning I was sitting and felt a weird pain in my vaginal area . It was kind of like a sting/pinch. Then I was walking around and felt it again . Both times it lasted on a few seconds and wasn't painful , just uncomfortable . I don't think that this is lightening crotch as it didn't really feel like the description and I'm only 21 weeks and 5 days . Now I'm just feels a pulsating feeling down there every few mins ....kind of like a throb. Anyone else ever experience this ?