Is there any cycle kind something where pregnancy chamces are higher i hear that after every 3 months pregnancy chances become higher?

No: There are lots of ideas that have floated around for centuries. Some people say women are more fertile in the autumn and winter. Some people say women are more fertile when exposed to more daylight. But, summer has more daylight than winter! even if fertility changed a bit with different cycles, things should equal out overall... So one needn't bother with such ideas.