Taking Pills Late Constantly and Plan B

I've been taking the pill for a year and a half. Recently, I've been forgetting my pill. For example, I'll forget to take it for 2 or 3 days at a time. It'll happen multiple times.

Today, I had unprotected sex (sort of). My boyfriend penetrated for a couple seconds without a condom and then pull out. No cum and I believe that there was no precum.

Should I take Plan B or should I wait it out? I get my period next week around Wed or Thurs or anytime during that week. I am going to my gynecologist this Friday, I will have her give me a blood test to check if I'm pregnant.