HELP WITH EMERGENCY CONTRACEPTIVES!!!

Erika
I had sex on july 22nd, my expected period date is the 25 or 26th around there. I ordered emergency contraceptives that are arriving today so i have time to take them effectively, but i was worried if i should or not. Will my period come on time? Will it come and then not arrive for a few months and i'll suffer a scare? Can I get my period and still be pregant? I had sex but he didnt ejaculate in me, he wore a condom before he came although there could be precum in me. What are my chances of getting pregant? My <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period app</a> said i ended ovulation on the 12th, although i got a clear discharge around 4 days ago so i dont know if THAT was my ovulation. HELP! should i take the ec or not