Missed it Again!!

I was working from home and I had Teagan on her play mat. I always put her on her back because she still isnt a big fan on laying on her stomach. Plus she always pukes when she is on her stomach. So anyways, i had her playing there, and i look over, and she is on her stomach!!! i missed it again! So far, no one has seen her roll over. Apparently she likes to do it in private. I was talking with Chris' mom, and she said the same thing happened to her. She put her down on her back and she walked away for a bit and came back and she was on her stomach. She is a quick mover.... Hopefully I will see her roll over soon!