Thanks for trusting us about your health care.
I can understand your concern here.
The spironolactone is a diuretic means it can remove excess water from your body through urine.
So urine volume is more and hcg level can be low (due to dilution of urine).
So it may give false positive result.
But it can not change hcg levels or so. (which you can see during pregnancy test).
Hope it is useful, feel free to ask more questions.
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