I got told DD was bottom down at 28 weeks but my Ob said there was still SO MUCH time for her to change positions so no big deal at all. He also told me percentages and it was very very likely she would turn around. Then at 32 weeks when he checked again and she was still bottom down he said very very likely she will turn and gave me more percentages that sounded favorable. My DD turned at 39 weeks! But apparently she is in the minority. I wouldn't waste any time worrying about it, you've still got ages to go