Dropping/lightening 29/30 weeks

For reference this is my 3rd baby. I had one about 16 months ago. This baby is due in two months. I was sitting on the ground with my daughter this morning and felt my baby kick then I felt like 100x lighter. I felt lightening last time but I think it was around 36/37 weeks. I am barely going to be 30 weeks on Tuesday. I am so confused has this happened to anyone I have definitely lightened quite a bit.