look sometime periods get irregular but take a blood work done just for peace of mind .
Good luck.
am no breastfeed anymore at all.
are you breastfeeding her or him? if yes than its normal that periods get irregular while you are breastfeeding her or him. but better if you take blood test just to confirm are you or not pregnant. Good luck
wait about another week and take another test make sure that you use the first morning urine