It’s OK. Deep breath. The next step depends on which pill you missed.
It was a placebo pill.
If it's one of the 7 placebo pills, you have nothing to worry about! Just continue the rest of your placebo pills as normal. And make sure to start your next pack on time on your usual start day.
It was a pill from week one.
If you were in the first week of your birth control pack, it would be a good idea to use condoms for the next 7 days after that "missed dose". After 7 days of taking the pill at the same time each day, you will once again be protected from pregnancy.
It was a pill from week 2 or 3.
If it was one of the 14 active pills in week 2 or 3, you should continue to take the rest of the pack as normal. If it helps you stay on track, you can take the last active pill in your pack in place of the pill you lost so that the rest of your active pills still line up correctly with the days of the week.
If it was an active pill, and you are now 1 pill short and no longer have 21 active pills in a row.
The "missed" pill means you won't have 21 active pills in a row by the time you reach your placebo pills. This may leave you less protected from pregnancy during your placebo break. Therefore, once you get to your placebo pills, we recommend using condoms once again until you have been back on your active pills for 7 days of the next pack (that would be 2 additional weeks of condom use). This is especially important if you stick to your normal pack start day as that would require you to take 8 days off rather than just 7 days off from active pills due to the "missed" pill.