I Am Expected To Get My Period Today, Although It

I am expected to get my period today, although it is not uncommon for me to get it a few days late. My boyfriend and I have had sex the week after my ovulation multiple times. There were a few times where we used the withdrawal method but then put a condom on in the middle of sex, and the other times he wore a condom the entire time. I am worried that I could be possibly pregnant. I have been very stressed the last week to two week, so I'm not sure if that is causing anything. I am not sure if me worrying is making me think I am having these symptoms or if I really am. Two day ago, I noticed I was having a heavy, clear, oily like vaginal discharge. I am still experiencing this discharge, but not nearly as heavy. I have also been experiencing some headaches and lower abdominal pain, that is almost pressure like. This morning I woke up feeling really sick to my stomach. I had a bout of diarrhea. About an hour later, I have diarrhea again but very watery and vomited stomach acid. I then went back to sleep and woke up another few hours later feeling sick again. I then had the very watery diarrhea again, but this time it was also bloody. This concerned me very much, so I then proceeded to my family doctor. She said I just had a stomach virus that was going around. Since being home from seeing the doctor, I have had some more bloody diarrhea, but not nearly as severe and I now have an appetite. Today, I also made a homemade pregnancy test with toothpaste, and the results came back negative. Even though these homemade tests probably aren't the most reliable, I just wanted to get an idea. I have not had the chance to buy a real, accurate test yet. From what I have told you, what do you think my chances of being pregnant are?