Baby dropped at 33 weeks!

Sooo, I am 33 weeks and 4 days and I had an ultrasound to check my cervix length because I've been having some brown spotting and cramping and my daughter is head down to the point where they had to do a vaginal ultrasound to measure my cervix. I had an ultrasound two weeks ago as well to see why she wasn't moving and to check my fluid and she was in a frank breech. I can't believe she moved so quickly and I noticed that my belly has dropped and I no longer feel her in my ribs or chest. I can feel her weight in my lower belly when I move around! No contractions yet. Just pinches and cramps but I'm so nervous, I have a feeling she is going to come early! She weighs close to 5lbs already! Has anyone experienced this early on and then went to 40 weeks?!