Pain in vaginal area during pregnancy?

Gabriela • First time mom. 23. Due 06.26.17
Yesterday I bent over to pick something up and when I twisted in the other direction, I felt a strong pain down in my vaginal region. It went away and it hasn't been hurting much, but everytime now I sit, or move in a certain way I'll feel that pinch down there, like if I sprained something. 
Has this happened to anyone before, and will this affect the baby, or no? 
Thanks!
I am 19 weeks .