Pregnancy Scare

So, I'm on the pill and I've had pregnancy scares before, but we had sex once when I had just gotten off antibiotics. 
My period isn't expected for another week, but I started bleeding a tiny bit today, ten days early. I've been nauseous a lot, both in the morning and in the day, and I've been having a lot of discharge which isn't usual for me. I also felt dizzy at times if I got up too fast.
It could be that I just upped my anxiety meds, or that I'm psyching myself out. 
I'm planning on taking a pregnancy test next weekend with him.
I've had scares before, but am I justified for this one? 
I'm honestly terrified and feel like it could be real this time and just need an outside opinion, please. 

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