If i am taking augmentin (amoxicillin and clavulanate) for 2 weeks for sinusitis while on mononessa(birth control) could that cause me to ovulate and/or breakthrough spotting?

Spotting: Clavulanate can interfere with effectiveness of birth control medication and it is quite possible that it has interacted with the hormone and decreased its effective concentration in your blood which has caused you to spot. This is also why it is always advisable to use a backup method of birth control while on such antibiotics.

Interaction: Taking antibiotics will decrease the effectiveness of your birth control pills by impairing absorption. This change in hormone level may contribute to your symptoms.