Can morning after or Plan B delay my second period?

Probably not by much. Your period is not likely to be delayed by using plan B. If there is any effect on the period is could start a day later, but then only if you took the plan B about 1 or 2 days before your period was due.

Related Questions

Can I take a morning after pill (plan b) four days before my scheduled period to delay my period a couple days?

Not what it is for. It wil not stop your period or delay it. If you want somethig to delay your period you will have to ask your doctor to prescribe NORETHINDRONE pill. but there are side effects---decreased labido,mild depression, bloating good luck :) Read more...
No. Plan B was not developed for that purposes. I would not count on it to change your period in any specific manner. Read more...