condom slid off as he pulled out, on birth control but should I take Plan B?

Hi,
Had sex Sunday night with my boyfriend and for the first time, the condom slid off as he pulled out to switch positions. I had to go deep in me and pull the condom out. He said he did not ejaculate yet. I am on the pill and take it daily but not at the same time everyday but I take them. 
Should I take a Plan B just in case today? Or would my birth control be enough? 
I don't want to take a Plan B if I don't need to but it's only been 2days since sex. Help :(
ALSO, has that happened to anyone else? Condom sliding off inside you? What did you do? Is there anything I should worry about?

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors