I'm on the pill and taking garlic. my flow is light this month. should i take a pregnancy test or should i wait until i miss a period?

Wait: BCP's if taken according to the directions are extraordinarily effective at what they claim to do (over 99 %). Of course if you skip doses or don't follow the directions exactly they don't work as well. The best pregnancy tests will pick up a pregnancy five days after the fertilized egg implants in the wall of the uterus. As always tests can be wrong.