Can Flagyl Cause Delay In Flow Of Menses?

can flagyl cause delay in flow of menses?
I am 32 years
54 kg
I had my baby on 9th of Jan.
Started menstruating on24th April but observed it flowed for 2wks although not has much as the first 5days.
I decided to take flagyl for a week
I expected to see the next menses cycle on 21st of May but till now have not seen it.
I decided to do pregnancy test using pregnancy test stripe. it read negative.