Emergency contraception pills (ulipristal acetate 30 mg or levonorgestrel 1.5 mg)

Emergency contraception pills

Pills taken to prevent pregnancy up to 5 days after unprotected sex

How it works: 
Delays ovulation
Effectiveness to prevent pregnancy: 
If 100 women used progestin-only emergency contraception, one would likely become pregnant
Comments: 
Does not disrupt an already existing pregnancy