Trimethoprim and birth control?

Hiya I have a UTI And have been given 3 days of Trimethoprim. I forgot to ask if this will affect the effectivity of my birth control pill (combined) NHS website says it won't affect with the pill or emergency contraception. The Dr and pharmacist didn't mention anything either and can see what I'm... show more Hiya I have a UTI
And have been given 3 days of Trimethoprim.
I forgot to ask if this will affect the effectivity of my birth control pill (combined)

NHS website says it won't affect with the pill or emergency contraception.
The Dr and pharmacist didn't mention anything either and can see what I'm on.
Has anyone else got any idea?
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