How many women does this happen to

So I went to the hospital a couple days ago because i had to get a check up. The doctor comes in and tells me congratulations you're 8 months pregnant!!!! I looked at the doctor and said PREGNANT!!!! How could that be I'm not showing? The doctor looks at me and explains how it happens, he said that some women do have this problem they will go all 9 months without showing and then they will get horrible pains and not know what's going on. I looked at the doctor as if he had just tried to explain Christianity to me. So my beautiful Christopher Grayson Alexander Tomes will here to say hello to the world in a couple of weeks. So excited 😃😃.