i had protected sex (using condom) in the first week of feb. i was expecting my periods on the 13th of feb, but because i was stressing, it got delayed by a weel, and started on the 18th of feb. they were absolutely normal and lasted for 5 days. its march 30th now and i havent got my periods yet. could it be because my cycle got disturbed last month? or could i be pregnant? i have been stressing a lot on it. also, im having cramps and burping like crazy.