If i took plan b 4 days ago, and i take it again now, will i have problems in the future with my menstrual cycle and getting pregnant ?

Plan B won't harm: Plan be can make you have spotting and delay your period. These are normal side-effects and are not an indication of it working or not. However, these are short-term side-effects. Long-term Plan b won't hurt your chances of pregnancy or cause problems with your menstrual cycle. Best wishes!

Plan B: Use of plan b should not cause problems with future pregnancies. It can cause short term issues with your menstrual cycle but I wouldn't call them problems.