The first day of my last period was on the 25th of August, it lasted until the 29th. Also, my periods are very irregular, the gap between my last periods was 40 days. On 3rd September, my partner and I had sex and he ejaculated inside me because we didn't realize the condom broke. About 8 hours later, I went to a clinic and got emergency contraception (Postinor 2), I took the first dose immediately and the second dose after 12 hours, as advised by the doctor. I've been having headaches on and off, also experiencing some dizziness and mood swings. Since I'm experiencing these side effects, does it mean that the pill is working or is there still a chance of failure? thank you!