AF is late

Im 2 days late right now. I took a pregnancy test on the day AF was due and it was negative. Usually I am never late for AF. The only times I have ever been late were the times when I was pregnant. I am 5 months PP and I got my period back 3 months ago and it has been just like before every 28 days. I am having "symptoms" I have sore boobs and feel sick to my stomach , but I also feel like that before AF. This is so darn frustrating. Should I go buy another test and try it in the morning if nothing has started? I dont want to waste money buying a test if AF will just show up. Or could it be my body still messed up from only being 5 months PP.

I'd wait a few days.

I'm 4 years PP and for some reason, I had a few periods 5-7 days late earlier in the fall. Sometimes our bodies just go nuts for a bit.

I'm 6 months pp & af been on times for the last 4 months until this month I was two weeks & 3 days late, af came yesterday morning, maybe it is our bodies going a bit nuts, I had symptoms too & I still kind of do, are you breastfeeding?