Is second ipill dose required?

Are there any side effects of taking another ipill within 4 days? I was very near ovulation, had second unprotected encounter 2.5 days ago. Before that I-pill was taken 4 days ago (within 10 hours) after first unprotected encounter. Had mild spotting also, very light drops, lasted for 2 days. All these happened within 11-14 days of cycle, my average cycle time is 28 days and it's regular. 12th cycle day: unprotected intercourse with pull out Within 10 hours: took ipill 13th cycle day: very light spotting, had unprotected intercourse again (after 32 hours of first ipill) with pull out but this time it's pretty sure that some of the semen might have been ejaculated inside. 14th cycle day: encountered very mild spotting (1-2 drops) Is other ipill dose required? What are the consequences of double dosage of ipill within short period and is it really effective or can be skipped for such short interval? What should I take care of and any symptoms I should look for possible pregnancy?