For last few nights I've had this nightmare 😢

Jacqueline • Mummy to twin boys after 2years ttc 💙💙
For last few nights I've had this nightmare that when I go for my 12week scan next week they will tell me my twins are an eptopic pregnancy :( I've had this fear all through since I've known I'm pregnant. What stage do the babies travel out the Fallopian tubes?Â