Do you think there can be a chance that I am pregnant?

The ovulation calendar isnt always right. I started my period on Feb 1 2007 got pregnant on Feb 18. I had my period on June 4th 2009 Got pregnant at the very end of June. But with all 5 of my pregnancies I always had the period feeling the bloating cramps. But I would wait to the day you are supposed to start to take a test.