Im confused ???

Ciara

So today i am exactly 5 months pp. I didnt get a period until 2 months pp and had one the next month as well. I have always been regular with my period, never any problems but i guess with having a baby things can change. I am now late on my period 8 days. I took a test at 6 days late and it came out negative. Is this normal? Idk what to do. Has this happened to anyone?