@Ayo. I had a friend who had a similar thing. I actually suspected cryptic pregnancy when I google about it. She saw her periods for 7months, all pregnancy test including urine and blood where negative. She did scan, they couldn't see anything till she was 7months gone. Why she believed she was pregnant was because she felt all the movements within and her stomach was also growing bigger. At exactly 9months and 2weeks, she delivered a baby boy. This kind of pregnancy is really weird.