I would stay off the pills till you know whether or not you're pregnant. If you continue on them, and are pregnant, it can harm the baby.

How long has it been? Have you had any breakthrough bleeding? If you miss pills and just start over, sometimes you'll start bleeding in the middle of the cycle, instead of when you're supposed to. This is bad news (speaking from experience).

Birth control, no matter what form, has a failure rate, so yeah, you should get a test. I think they usually recommend waiting 2 weeks after a missed period, but not sure.

From WebMD:

What If I Forget to Take a Pill?

If you forget to take a pill, take it as soon as you remember. If you don't remember until the next day, go ahead and take 2 pills that day. If you forget to take your pills for 2 days, take 2 pills the day you remember and 2 pills the next day. You will then be back on schedule. If you miss more than 2 pills, call your doctor. You may be told to take one pill daily until Sunday then start a new pill pack or to discard the rest of the pill pack and start over with a new pack that same day.

Any time you forget to take a pill, you must use another form of birth control until you finish the pill pack. When you forget to take a pill, you increase the chance of releasing an egg from your ovary. However, if you forget to take any of the last 7 out of the 28 day pills you will not raise your chance of pregnancy since these pills contain only inactive ingredients. If you miss your period and have forgotten to take one or more active pills, get a pregnancy test. If you miss 2 periods even though you have taken all your pills on schedule, you should get a pregnancy test.

It is very important to take the mini pills (progestin only) at the exact same time each day. If you miss a pill or are more than 3 hours late for a pill you should take the pill as soon as you remember and use a backup method (such as a condom or spermicide) for the next 48 hours.