I had emergency surgery 4weeks ago after a mower accident while on my period. my period was shaky after that and this month it's 2days late.normal?

Possibly: Am assuming that you have not been sexually active since your last period. If your body has suffered a significant trauma/ stress - than a period may be late or missed.

Normal: Many women fluctuate several days early or late with their menses, so with the stress you have been through, 2 days later than expected is not unusual. I hope you have recovered from your accident.