Hi Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern...
Yes intake of Ipill could cause delay in periods for weeks. Delay in periods is a common side-effect after intake of an
emergency contraceptive pill like I-pill. The delayed periods are due to effect of high dose of
levonorgestrel hormone in I pill which disrupts your normal
menstruation & causes delayed periods. Your periods may be delayed for 1-2 cycles.
As you had taken the emergency contraceptive pill within 2 days of sexual intercourse, pregnancy possibility should be less.
An emergency contraceptive should not be used as regular method of
contraception. Regular intake of emergency contraceptive pill could cause irregular & delayed periods & other harmful effects including
infertility. Next time use regular contraceptive pill or condoms for prevention of unwanted pregnancy.
As no method of contraception is 100% effective, You are also advised to do a pregnancy test to rule-out slight chance of pregnancy.
Don't worry you would be fine
Hope this information helps