pregnant on birth control

Leo
Hey everyone. 
I'm sorry if this is a stupid question but I don't have anyone to talk to or ask questions. 
Sorry in advance for the long post:
I was put on birth control in November 2016 for lack or periods and as treatment for possible female triad syndrome. I was put on Junel fe 1/20. Things were ok but weren't helping so after consulting I was prescribed a higher dose Junel fe 1.5. 
Here is were you guys come in. 
I never missed a day. And always took the pill within 30 min of the usual 24hr time. 
I had sex with my bf and I guess he took off the condom at one point because it was dried out or some thing. 
He has never cumed inside me but I'm pretty sure there has been pre cum. 
I am asking all you amazing women out there for help because I missed my period last week. 
When I contacted my Dr. she told me it was unlikely to be pregnant but I could take a test to put my mind at ease. 
I have been in able to go to the store and will go next weekend but if anyone could provide and info help or words of support until then that would be amazing because I am low key freaking out scared out of my mind and alone. 
Sorry for such a long message but it's been a while singes I've felt like I can trust anyone. Maybe it's the annonimity of the site. But can I be pregnant while on birth control, from pre cum????
Sorry again about the length. Sorry to bother you all as I doubt anyone will even read this. 
I'm sorry. 

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