What Causes Clear Vaginal Discharge, Breast Pain And Nausea?

Hi. I was off bcp on 30th July (only after taking for a month - but I accidentally took 22 pills instead of 21). I had bleeding for the next 5-6 days. On the 21 Aug, I had unprotected sex with my boyfriend twice, and took postinor 2 within 24 hours of the first intercourse) and the next pill 12hrs later). A week on (which is now), my period is not here (I have no idea when to expect my period actually - I usually have 32 day cycles but idk how one month of bcp will change it). However, I m having clear watery discharge, having breast pains and nausea (I usually have nausea before period so i m not v worried). I did 3 home pregnancy kits (including one early predictor), and all 3 showed negative. Is it possible for postinor 2 effects to last for so long, and may I know when I should expect my next period?