The plot thickens.
If the discussion you had was positive, in her minds eye she may believe you want to get married sooner rather than later; which solidified her decision to stop taking birth control.
Your best bet is to sit down and talk with her again, without judgement. Let her speak first, listen to what she has to say (let it marinate before you respond).
There's a form of faulty communication on both sides. If you don't put forth effort to understand her feelings and convey yours in the process, will lead to disaster.
First of all thanks for the advice. Secondly, she does'nt work I provided for the both of us. And I told her if she was the be the home-maker that's fine.But marriage will have to wait. But you do have a point there is a communication gap on both sides and as a man I will call her and find out her reasons why her mind changed.