As per Teak's comments - I think that there are a lot of "what ifs" here.
1. With a standard antibody tests, a 3-month test is conclusive; but you can get something reasonably comforting at 4 weeks post exposure with a combined HIV and P24 antigen test. Try the clinic at Church and Wellesley.
2. Odds of a straight male, non-IV-drug user in Canada having HIV are small. In the UK, they say 1/1000.
3. Odds of contracting HIV IF he were positive, for you, would be 1/1000 per exposure
4. You don't actually know if he slept with 4 women unprotected.
5. Calm down. It is unlikely you contracted HIV; get a test at 4 weeks for comfort and speak to your doctor then about testing and risk. He/she will be much more knowledgeable.
If you have further questions, direct them to HHH, Hook, or Cummings in the expert forum.
We don't do "what ifs" on this forum. A 3 month test is conclusive. 6 month tests are outdated and haven't been used since 2004.