Pregnancy anxiety????

Don’t know if this is anxiety or not and if I should tell my doctor. I don’t know if I should seek professional help or if it will go away. Help me please, let me know if you or someone you know has been through something similar.

So me and my husband have three kids. A 9 year old, a 2 year old and now one on the way. When I was pregnant with the 2 year old is when this “anxiety” started to develop. I could not wrap my brain around the fact that after 7 years we would be having another kid after so long. There were no miscarriages or pregnancy scares between me and my husband so I was scared and confused. Of course I was excited that god blessed us to have another after 7 years but I couldn’t wrap my head around it and begin to obsess over miscarriages and having a still born baby. I would stay up all night and read stories of parents who lost their kid. It got so bad that I couldn’t even pick out a name for our son until he was born in the hospital. So now I’m pregnant again and it’s happening all over. I hate these thoughts and am terrified. Everyone always tells me how great my kids are and how I’m a great mom but I don’t know why I’m not good enough or feel like I don’t deserve them.