Is she not telling me the truth about being pregnant?

I was with this woman, she is 27 and im 22 and we cared about each other a lot for a while and we started to break up and now she is telling me that she is pregnant. She told me that she was pregnant almost 12 days after we had sex for the first time, is this to early to tell or am i just being nieve on this. Another thing that bothers me is the amount of lies that she has told, you see the reason that we broke up was that well i was sitting in her house one day and a knock came at the door and i ran for my life cause….. she didnt tell me she was married….. i mean OMG she is actually married and telling me shes having my kid and the crazy part is that i asked him after the stuff was settled down and what not and hes saying that shes not cause “she miscarried” and she was telling him that it was his kid to and i dont believe that she is pregnant and his family is telling me that she isnt as well, what do i do, i try to go to the doctors with her and stuff like that but everytime the apt comes along something happens and i cant seem to be there with her. I dont know what to do, well i know what i have to do. i have to wait till april and then ask where my kid is but other then that i am not the type of guy to not be around the woman that is having my baby i mean this was 5 months ago now and she is not really showing at all, she is in the same cloths that she wore when we first started seeing each other. I know that doesnt mean anything at all to tell if she is or isnt by her stomach. I mean i recently found out another lie that she told me. She is going to a methadone clinic for drug abuse and if she is pregnant at this point is it going to hurt my baby ???
What can i do without being a dick about it, i had to change my number in the end cause i tried to start another relationship almost 5 months later and she starts on me again calls me and stuff and i almost lost the woman that im with now. It still bothers me that shes still saying that shes pregnant with my kid, she doesnt really have a belly on her, it looks like she gained about 10 lbs or something but thats about it. She also has 3 kids by 2 other guys and oh one last thing after she had her last kid she had her tubes tied and cut not burnt or anything like that so can anyone help me please
I cant get her to take a pregnancy test, she will not let me take her to get one and i dont want to mess with the relationship im in now. I know she had her tubes tied and stuff like that cause i did see papers on that, and she has had 3 c sections so the child could not be a natural birth anyway, she says shes having complications and its killing me inside to not be there for her…. really im not like that i would stop my life in its tracks to take care of someone having my baby

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