So question on 1/27/16 I had my baby, I bleed through February & had my period on March 5th. I…

So question on 1/27/16 I had my baby, I bleed through February & had my period on March 5th. I thought I was suppose to start my period April 5th or before but it hasn't came. I've been cramping since the last week on March beginning of april. I took a HPT last week, came back neg. still no period? But cramping