Lightening (baby “dropping”) suddenly at 28 weeks?

This is my third baby. Both my previous babies were breech at delivery and required planned c-sections at due date. I never experienced lightening with them and carried very high until the very end. I didn’t have any real signs of labor leading up to their due dates.

With this baby, she was breech at the 20 week ultrasound and until very recently “felt” breech. After two previous breech babies, I know how it feels—like a tap dance on my cervix, basically.

Today my husband and I had sex and very shortly after I began to have painful cramps in my pubic bone and tailbone area. They felt like period cramps, a steady pain, not on and off like contractions. They were very painful and I am still uncomfortable (but lying down). When I looked in a mirror I realized that my bump (previously very high) had noticeably dropped. I’m still feeling regular movement, but it’s hard to tell exactly where. The last kick just now felt kind of centered in my abdomen.

Could she have turned? Has anyone else experienced a drop so early, and if so, what happened? I will be calling my OB soon, I’m just curious about similar stories.