My last period was on March 16th . I was due for my period on April 13th . I am now 5 weeks late . I have recently had a baby in November , (didn't find out I was pregnant with him until I was 14 1/2 weeks)  but since I've had him my periods have been regular . I've taken two pregnancy tests one at 2 weeks late and the other one at 3 weeks late at the doctors office , they were both negative. Has anyone had this happen before ? If so what were your results ?