I honestly don’t know where the 3 months detection time for test enanthate comes from. When you think about it logically …
Testosterone, even esterified testosterone, is chemically identical to your own natural endogenous testosterone. So there is no foreign metabolites left once the substance leaves the system. This is why synthetic steroids are easier to detect and can be detected for a longer period of time: even when the drug has left the system, there might still be some of their metabolites in the body. Since metabolites of synthetic steroids are not normally found in the body, even the slightest residue left will be detected. This is why some anabolics can be detected for upward to 3-8 months (even more than that in some rare cases). However, since testosterone has no foreign metabolites, and since the substance is normally found in the body, the only way to test positive for testosterone is if the test:epitest ratio is over 6:1 (which is a pretty conservative set point considering that in a normal individual the ratio is 1:1 … the ratio is set at the maximum possible level to avoid legal problems).
Test enanthate has a half-life of around 10-12 days. Depending on the length and importance of the cycle, that means that after 4-5 weeks there should not be any exogenous test in your system.
Because of both of these reasons I believe that your test:epitest ratio should not be out of whack and lead to a positive drug test. However it’s still possible, but doubtful. Heck, most athletes can get away with 50mg of testosterone propionate every 3-4 days and still be under the 6:1 ratio… Many will take 25-50mg of test suspension (half-life of less than 24 hours) per day and be able to test clean by stopping 2-3 days before a test (I would not recommand that you do this though, athletes who do this have their ratio tested frequently by an hired doctor so they know exactly how much they can get away with).
I suggest fasting 24-36 hours before your test as fasting has been shown to lower testosterone levels (this strategy has been used by bulgarian lifters several times).
Other than that all you can do is pray and stick with short acting testosterone (propionate or suspension) in the future.