I have three tattoos, and got two of them done while on birth control! It will not cause any side effects for the tattoo, or the birth control! Everthing will be just fine! I do agree with the previous statement, make sure that you have a tattoo that you really want...and keep in mind you will have it for the rest of you life! My biggest suggestion is not to pick one from the flash, design something unique, and be sure that they do not put it in their flash....anybody can have it then, this happened to me and I was very upset. I have a great tattoo guy now, and will never go anywhere else, also be sure they are really sanitary. A good way to do this is to use their restroom, see what kind of condition it is in, and also see what kind of soap is there, if the public restroom is also the employee restroom!
Hope this helps!