If you forget to take a birth control pill, you should take it as soon as you remember. Then, continue taking the rest of the pills at your usual time. If you usually take your pills at night, take one now and another one tonight at the same time. Make sure to follow your usual schedule from then on. If you forget more than one pill, the instructions may vary depending on the timing in your pack. In that case, it's best to consult with a pharmacist for guidance.