......Is possible to have an ectopic pregnancy at 4 months?

I'm finding it had to believe someone at my work, who said she was 4 months pregnant and suffered an ectopic pregnancy. I thought something like this would be detected fairly early on, due to the pain, discomfort etc... But i don't want to doubt her or to know someone is lying about something like this!! I've suffered 2 missed miscarriages, 2 blighted Ovum and have 2 boys - so it upsets me to think she could be lying.

I want to trust her, but she takes every monday off work and says 'something' happened to someone. She is now 12 weeks pregnant and she didn't have a car for about a month and was off because she was so ill, but now she has a car and she is 12 weeks the sickness has completely gone (I am also worried about this as I know symptoms can disappear when a baby is lost and generally hope my girlfriends have sickness for a little while longer). I feel really bad not believing her and am even managing to convince myself it's because I'm jealous....but I'm not that kind of person, I'm always so happy to hear baby news, Grrrrrrrrrrrr, I'm feeling very frustrated.

Thank you
xxx