It could make your life more than difficult.Get tested. 3 months post exposure will give you a conclusive test result.
This would constitute a HIV risk and it is important that you test to be on the safe side, you may try going to a Public STD Clinic as they will have testing facilities (depending where you live of course), however you local Doctor would be able to provide you with a referral for a test and have to keep your test confidential as would the testing lab (Patient confidentiality).
On another note you should consider reporting your coach, he should not be allowed to get away with what he has done, however I understand that this is easier said then done.