lab and u/s

Mia
So went to my doc today. She did an ultrasound and said my lining is a little thicker than last time meaning i did ovulate. She said the follicle that she saw wasn't there anymore. Where did it go!!!! Anyone knows what happens to it??? I had an hsg like 2 weeks or a week before and once 48hiurs is done we BD straight. 
Have I missed my window? Anyone went through this? Or have thin lining? What does it mean! Af due next week. Baby dust pls! Took a pregnancy test this morning and negative.