Yes, I know exactly what you mean. I got them with my 3 pg's. It all depends on where the baby is positioned as they can push on a nerve down there. The pain doesn't last for long, but while its there it hurts like the blazes! (and that's putting it nicely LOL). It's nothing to worry about and should settle down as bubs engages and moves futher down (this may not stop it altogether, but will slow the frequency of it happening I found).