Chances of being pregnant?

Megan • TTC Baby #1 ❤️
I really don't wanna be one of those girls freaking out asking if she's pregnant but I would like some of your opinions ! 
Hey ladies , so last night my boyfriend and I had sex and he came inside me. Earlier in the week I was a couple hours off taking my birth control on Tuesday and Wednesday. My fertile days started Tuesday so do you think I could've released an egg and now I could be pregnant? <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">EVE</a> says I had a 27% chance of getting pregnant yesterday and I believe the highest percentage is 33%? My boyfriend and I aren't married yet and I still have 2 more years of college so we weren't really planning for this. Should I erase my worry and take get Plan B or do you think the chances are too low of being pregnant? I also just feel really wrong taking plan B because we did this and it's on us anyway. 

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