I took the plan b pill (or a generic like it - i cant remember) about one week before receiving my second dose of the covid vaccine (moderna). will the plan b pill interact with or affect the efficacy of the vaccine?

no, this should not impact the efficacy of the vaccine.

No. Plan B won't interfere with the effects of the COVID-19 vaccines. Please get on reliable birth control though and avoid the need to take Plan B! Plan B does not prevent STD's. Get checked for STD's promptly.

Having taken Plan B will not affect the effectiveness of the vaccine. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs.