I am 16 weeks pregnant and for quite a few weeks, most nights have woken up sweating - and really thirsty. I've also been experiencing headaches. I thought it might be down to hormones but my duvet is quite heavy -10.5 tog - thinking that may have something to do with it - I'm worried I've caused harm to my baby. Am I being stupid or should I get things checked over? I am going to use a lighter duvet cover going forward....