Period

So my period was due yesterday I was very regular before getting pregnant and straight after I gave birth I fell back in to my normal cycle (gave birth on March 6th 2021)

I have a 29 day cycle..

I've had cramps and feeling sick for the past week but I'm not pregnant any ideas why I could be late ?

Update- no changes, no meds, weights the same, literally nothings no different to any other month and ovulation happened 2nd October 🤣🤣 still no period