Hair THINNING whilst pregnant?

Kim
Hi!
So I've heard all about hair going lovely and thick when pregnant and then of course losing it after the baby is born however... My hair is going really thin toward the front of the head fringe area and parting) and I'm 14 weeks pregnant. 
My hair is normally so thick
It's really worrying me and making me so upset and anxious. 
Does anybody else have the same problem? Is there anything I can do to prevent/stop this? Is it normal? 
Any help will be massively appreciated xx