If you think you are missing your period, you can certainly take a test. It sounds like you are just having a late period, but a test will prove that or not. Sometimes it's good to take a test just to calm your nerves.
I think you are now a bit earlier on your periods too since February has only 29 days this year, so it would thrown things off a bit. That would make your expected date for this month earlier as well. But all of this does depend on how regular you are as well.
The pullout method is not effective for preventing pregnancy. Even pre-ejaculatory fluid has sperm in it, and he can not know when this is happening when he is inside you. If you think you ovulated around the 14th, based on that you wouldn't be pregnant because you had sex a little over a week AFTER you ovulated. You need to be ovulating or close to it to get pregnant.