What are the chances of getting pregnant while on birth control but the condom breaks?

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I just took the last pill of my pack(Just finished my period) I had sex with a condom on, but the condom broke and he ejaculated inside. I take the pill regularly, what are the chances of being pregnant? Should I buy Plan B?

about 1% chance
Its possible, but very unlikely.
Nothings 100% protective though.
I think the pill is around 97% effective so i don’t think there is anything to worry about, however a Plan B might help stop you worrying, so maybe it would be a good idea if only to ease your mind.