Thanks for choosing HCM,
your problem of delay in peiods after the course depends on vaious reasons
see if you can find an answer from the questions below
1.did you put on or lose weight recently?
2.are you under stress?
3.any climate changes?
4.did you change your diet pattern?
5.did you start or stop exercise?
6.are you married ,better check if you are pregnant(failure of ocps generally is very less but better do a test)
or may be you have missed your pill or taken them at irregular timings,
everything goes fine
wait for a few days ,perrform pregnancy
test,meet your doctor if you are worried
hope i answered all your queries
feel free to contact me for further queries