I got married 2 years ago. We don't want to be parents immediately so I used ovuloc ld tablets for 2 years that is till last april. I stopped using tablets from may.in may I got cavity positive and get recovered in 10 days. In that month my period was missed and got it after 15 days of my period date. And this month's also I missed my period .it's been 45 days from my last period. I checked with home pregnancy test kit. But it was negative. Will you please explain what was the problem.