I'm very scared that I may be pregnant?

[Asinof]

Okay so I'm a 21 year old virgin and my boyfriend and I were having some fun on August 28th. He rubbed agaisnt me while we were both naked and came but he says he pulled away from the area before any got on me. I saw him pull away but I'm not 100% that none of it got on my genitals. He Also says there was no Precum. We only made contact for about 3-5 second before he pulled away and he says he used his shaft rather than his tip. In my room that night, I had really bad cramps. He says its because he fingered too roughly but some forums online say that implantation bleeding can also begin with cramps.
I checked my period cycle and it says I ovulated a week before this incident occurred and apparently ovum disintegrate after about 24 hours of not being fertilized. I took Plan B Levonorgestrel 30 hours after the incident occurred but ive been stressing like crazy. I started taking vitamin C supplements and turmeric because I heard it induces a period and I'm going to use some warm compresses on my stomach as well to induce it if possible.
Apart from this, I've been looking at home pregnancy tests without a kit because I can't get my hands on one right now. I peed in a bottle and it said to look for a white froth forming above. I've done that 3 times and it was normal. But I'm worried that the hCG wouldn't be released so soon after fertilzation/implantation to be detected so early. I intend to take a test or two after my period but is it possible that I could be pregnant?  I've read about some people having their periods and then getting pregnant.
I know the whole theory about it taking millions of sperm to actually penetrate the egg but I'm scared out of my mind that I might have gotten really unlucky.
What are the chances that I'm pregnant? I know I made a mistake and I regret it but I would appreciate anything helpful and consoling, I'm extremely scared.