The Blues?

I am going through this thing that I dont like. If I am home by myself during the day I start to get slightly sad. I am not sure it is depressed...it's not like I am crying. I just get sad. When Jamie is home, I am fine. When we have people over, I am fine. When I am at work, I am (usually) fine. But when I am at home during the day I just start thinking about family and friends and struggles and schedules and everything else....and I just get sad. Sometimes I think it could be really easy to slip into a depressed mode...but I really do try to fight it. Also Christmas is kind of up in the air this year, seeing as I don't know what will be going on at that point in time and financially we aren't going to be able to do anything for anyone this year. I love Chistmas and it makes me sad that I cant go Christmas shopping I dont know if this feeling is normal? Is it because I am pregnant? Is it because it is winter? Is it both? I am not sure... but I am praying that I get over it soon because I dont like feeling so unstable.