If i had my menstral cycle on 29dec when will i be expecting them again?

Hard to say: A cycle length (from the first day of one period to the first day of the next period) of 21 to 35 days is considered normal. But many women have irregular cycles. So if you started a period on 29dec, you would normally get your next period between 19jan and 2feb. However, it depends on your personal menstrual history. If you're late, check a pregnancy test to be safe!

Review your history: Most people have a cycle every 21-35 days. Use your past history as a way of predicting your future menstrual cycles. If you normally have a cycle every 30 days then that is probably what you will do this time too.