What Causes Delayed Periods After Taking Emergency Contraceptive Pills?

Hi! I had my LMP on April 6 (if I m not mistaken), had unprotected sex on April 22. That morning of 22, I saw a really thick white discharge that came out of me and I thought, that indicates that I am fertile. Not sure if he came inside me (he said he didn t), but anyway, I washed and peed right after that. After a few days, I came across ECP on the internet and found this specific brand called Nordette. I tried looking for it in the drug stores, but they weren t available. I bought Lady Pills instead (I believe they have the same content). I took 4 pills on the 26th and another 4 pills after 12 hours. That was 4 days after the unprotected sex ( they said you take ECP as long as 5 days). Just recently, I tried researching the internet and found that the type of dicharge that came out of me that day of 22 indicates that I am infertile, so I assumed that the ovulation has occured already before we had sex. I have been feeling a very mild PMS, and I am supposed to get my period today (April 5). I usually have 29-31-day cycle. What are the chances of getting pregnant and is it possible that I will get a late period because of the pill? Thanks!