How do you know if it's an ectopic pregnancy without having a scan?

You would have extremely bad lower abdominal cramps. The ones you can't walk with. If you are pregnant now and are concerned tell your doctor. Your tubes can burst and get an infection following it.

Further to this- 5 women in the UK die every year from missed ectopic. Also, you will most like have prune- juice like bleeding- dark and syrupy. Treatment is either a shot or surgery which may lead to the loss of the affected tube.