If your pregnancy tests are negative you shouldn’t continue to worry about pregnancy; birht control pills are the most secure form of contraception. You don’t need condoms unless you want to protect yourself from an STD. However, you should have menstruation while you are using birth control pills. One of the points of birth control pills is to imitate a real cycle, including menstruations. The cycles you experience while on the pill are not real menstruations because there is no ovulation... but menstruation helps make a woman feel normally. The last 7 pills are not active (don’t contain hormones). The week of sugar pills is usually followed by a false, or "pseudo", menstruation. I recommend you to consult your gynecologist about the fact that you are not bleeding at all.