Your question was answered by our members fully.
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The only risks for HIV in adults are:
1) Having unprotected anal or vaginal sex, or
2) sharing intravenous needles with IV drug users.
If you do not engage in any of the activities I mentioned above with someone HIV+ or whose HIV status is unknown to you, you will NEVER have to worry about getting HIV. There is no "but what if?" scenario you can present that will turn ANY other event into a risk for HIV.
Unless you have cancer treatments which use powerful meds, your test is not affected.