Just to keep perspective, STDs and STIs are ALWAYS an issue unless youy're talking about couples who were raised in bubbles. Wish they weren't, but they are. Even standard bacterial infections can develop a few days after a test is done and be transmitted.
Clear tests and practicing safer sex monogamously for at least six months greatly REDUCES STI risks, but nothing can eradicate risk of all STI transmission. So, make your choices accordingly, but overall, a clear test alone doesn't create a reduced risk unless partnered with at least six months of monogamy AND safer sex as well as another set of clear tests at the end of that period.
It is safest to wait at least one full cycle of taking them, because bodies vary in terms of absorption and assmilation of hormones. We always advise waiting one month. In the meantime, all you need to do is couple the pill with a condom, which is the smartest thing to do regardless, both in tewrms of borth control (the pill isn't 100%) as well as STD and STI protection.
Editor and Founder, Scarleteen
My epitaph should read: "She worked herself into this ground."
-- Kay Bailey Hutchinson