Could you please help me find this movie?

I watched this movie about 3 years ago, I don't remember the cast but I can still narrative it a bit and I would be glad if you can get me the title. "It was a romance/comedy movie. The heroes actually were in love but restricted by the lady's parent so the the man made a proposal to the parents to allow the lady to stay with him for 4 weeks but they gave him only 2 weeks with terms such that the man and the woman shouldn't sleep together and they should not have sex. One day, they made a mistake and slept together. After few days the lady was experiencing signs of pregnancy so they decided to test. They did four tests, one was positive and three were negative..."