No DPO date/ possibly pregnant

I was careless with my birth control pills last month, and I didn’t end up having my bleed on my placebo pills when I normally do. I took a test this afternoon and it was negative. I may have line eyes and thought I saw something. It’s two weeks since I last had sex so I figured it would be an obvious positive by now, if I were,right? I have one more test I’ll take tomorrow with FMU, then I’ll call it as a safe negative. I’m due to start a new pack of pills tomorrow.