Lele was right, it's all about what you're comfortable with.
Statistically, you are 99% protected after the first week of pills if you are taking them correctly. Meaning, mostly on time (there's wiggle room with the timing, though) not missing any, not taking antibiotics or St. John's wort, not throwing up within a few hours of taking them, that kind of thing.
But there's nothing wrong with being extra careful, and if you would feel better using condoms, do it!
Lele- how's paragard working for you?