Hi, I took plan b one step about 20 minutes after learning that the condom that we were using broke?

I usually start my period the 1st or 2nd of every month!

That's a little more worrying, then, because that would put you around the time of ovulation. Most women ovulate around day 14, but not every woman (Day 1 is the first day of your period). With a bit of luck, you'll have already ovulated, but it's not a guarantee.
There is another form of emergency contraception, which is to have an IUD/Coil fitted by a doctor. This can act as emergency contraception, by preventing implantation of an embryo into the uterus lining. Plan B works by delaying ovulation, but it may have been too late to do so in your case. It's thought it 'might' work in other ways, but they're not proven, & so the Manufacturer does not claim them.
If you have an IUD/Coil fitted, it can be left in place as longer term contraception, if you want it to. I've tried all the various types (some are hormonal, some are not).

P.S. It's possible your period could be late due to the Plan B. Some women find it's days late, & for others, weeks. You can do a pregnancy test once you don't start, to put your mind at risk.

(Sorry, I should have explained - the cervical mucus turns quite egg-white-like during ovulation)

So what you are saying is it may have been too late for me?

It's really hard to say, because you might have already ovulated, or you may have actually been ovulating. It's highly likely that you weren't still yet to ovulate, though, so the Pill will be unlikely to have acted the way it's supposed to, & postponed your ovulation. I don't like to scare people but I'm sure you'd rather me be honest. At least that way you still have time to get an IUD fitted, if that is what you want to do. I know it depends where you live as to how easy this is to do. Here in the UK it's free & very easy. 5 minute procedure at a family planning clinic.

If I haven't ovulated it won't work? But if I have it will?

If you've already ovulated, there's no risk of pregnancy even without the Plan B, but very few women chart their temperature, cervical mucus changes & cervical position every day, so that they know exactly when they are ovulating. They tend to take Plan B, to be safe, if an accident happens.
Plan B's stat.s are based on it being able to postpone your ovulation. If it can't do that, then it may not be able to help. If you're already ovulating, it can't postpone it.

The problem arises if you were ovulating whilst you had unprotected sex. That's when you'll conceive.