I NEED HELP AND ADVICE!!

Monica • My best qualities I have is: I can nap, I like to watch Netflix for long periods of time, and I like makeup(:
My SO and I were having sex with a condom and it broke when he took it out of me. And little actually did get inside of me. 
We started to freak out so I took a shower to wash off at this sperm. 
Once I got out we took a trip to Walmart and I took plan B. 
The problem now is my boobs are sore and extremely tender. And I feel hungry often and I want to have sex but I don't. And I know plan B messes with your hormones. But, the last time I had these problems was when I was pregnant for possibly a month and lost the baby. 
I don't know if I should take a pregnancy test or go to my doctor??