Someone please help with this question!?

Ok my best friend met this dude a couple of months ago and he told her that he had been divorced for 2years..Ok he told her that he had a vasectomy a couple of years ago..and she's been having with him for a couple months and has had her period every month..well the last time she had with him a a couple days after wards she starting feeling sick at her stomach but nothing major..but a week later stomach upset has occured and she's nauseated...and then yesterday she gets a call from is wife and if he lied to her about that is it possible for him to had lied to her about a vasectomy? could she be pregnant?