Re abstain: Yes, for 7-10 days prior.
While you can DTD every 3 or 4 days with protection and then have only one attempt, it's not classified as abstain.
EVERYONE gets pregnant "close to ovulation". It's because you can only get pregnant within about 3 days of O (while a few pregnancies happen 4 days before O it's much more likely that it was 1-2 days before O or very early on O Day) So a lot of people will look back and think "well I BD practically at ovulation" but that's just when babies happen!!
Neither abstain nor FR has really worked well for us. One attempt has, and even if it didn't work for you the last time or two it's always best to do what has worked for most people most of the time.
Green tea may sway blue so I'd skip that. Peppermint tea may sway pink, but it hasn't gotten stellar results and has really messed up people's cycles but 1 cup a day usually doesn't do that.

