How should i feel about my friend who is a potential pathological liar?

so about 10 months ago my friend told me that she was pregnant as her and her boyfriend were breaking up, she said she was going to hve an abortion and i was possibly going to go with her.. then she told me she had a miscarriage in the middle of the night, i had a strange feeling after she told me that but i didn't want to doubt my friend.. about a week ago she told me that she was pregnant with her new boyfriends baby and they are also planning to break up soon.. she told me that she was throwing up and having to pee 10 times a day which i thought was strange considering that she could only be a few weeks along if she ws pregnant.. i offered to buy a pregnancy test for her and do it with her and she said it would cost too much money, then this morning she told me that she ended up going for an ultrasound and that it showed she was 3 weeks pregnant, she also said she ended up buying a pregnancy test to be sure.. i met up with her today and kept asking if she brought the ultrasound pictures or the pregnancy test and she said she threw the test out and the pictures were at work.. so i asked her to show me the email that she sent to her boyfriend telling him that she was pregnant because she had attached a picture of the ultrasound and pregnancy test, she showed me the email and that was that.. i came home and had a very strange feeling about it all so i decided to search on google for ultrasound and pregnancy test pictures just for the hell of it.. i was in shock as i found the EXACT same pictures that she had emailed him.. i feel extremely disturbed that my own friend would lie to me about something like this and that she is faking a PREGNANCY.. something that is such a sensitive experience.. i feel disgusted and now wonder what other lies there have been within our friendship.. i wasn't sure of what to make of all of this and then someone suggested to me that she might be a pathological liar, so i looked into the symptoms and character traits of pathological liars and she seems to fit the "profile" quite well (i.e. low self esteem, being the less favoured sibling, not living up to standards at home, etc).. she has been known to tell lies and i have often found myself questioning many of her stories but never put it together until now, although this is just an assumption i have no actual 'proof' that she is a pathological liar... i just know that she definitely lied to me and her boyfriend about this pregnancy (and most likely the other one as well) and i felt sickened.. but once i started seeing it in terms of her being a pathological liar, i started to see it differently and even felt sorry for her.. does it make her lie to me any less deceptive if she is a pathological liar? should i feel less betrayed as a friend? what do you think? and how do you suppose you would feel in a situation like this? thanks for your time