Im 35 wks and I am losing some of mine...
I started losing mine at 33 weeks. I wouldn't worry too much about it unless all the other fun stuff starts happening. Just one of those, keep an eye out and get plenty of rest situations.
If it makes you feel better I'm at 37 weeks now and scheduled to have baby on the 23rd of this month. :D
Nothing to worry about. They can regenerate.