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I started taking Tri-previfem birth control by my doctor which is the generic version of Tri-sprintec 2 days go when my period started and I noticed a slight different in my period.
apny12 apny12 26-30, F 6 Answers Jan 24 in Community

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That is the start of your cycle.

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Because they are formulated to counter your natural rhythm and that is the point at which they are most effectively introduced.

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You should look at the insert, drug fact sheet, or ask the pharmacist

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