There are loads of birth control methods besides the two you mentioned. Most common is the pill but others include the sponge, spermicide, and a diaphragm. The doctor was most probably refering to not using the pill with the blood thinners. I'm sure there is more than one effect combining both birth control pills (that are known to clot your blood) and blood thinners but I from what I've found it seems that the drugs just won't be as effective. So the blood thinner won't thin as well and there's a chace of getting pg even if you're taking the pill.

i was just wondering if its ok to wear a birth control patch when you get a tattoo? because im getting a tattoo this friday and i was just wondering if it was safe to wear my patch.