Missing period

Hey ladies,

I was just asking why my period keeps not coming, I gave birth about a year ago, and ever since my period has not been coming every month. It came last month and than about 4 month ago it was late for 2 month, I went to the doctor but she told me it was normal. I’m just worried because it either comes for 3 days or it doesn’t come at all... and this keeps happening! I’m just alittle worried!!!!! 😔 also I’m sure I’m not pregnant....