I think I'm pregnant

I'm almost 20 and in my graduating year of college. I'm not ttc but I've recently switched to a new birth control brand and I am having no signs of my period. I haven't been the best with my pills this month and I have unprotected sex with my boyfriend often. I'm 4 days late now and very regular usually! I'm having some symptoms that I have never had before. Acid reflux so bad my throat burns when I barely burp, hard ish stomach, lack of apetite/feeling somewhat sick in the morning. I took this test just now from dollarama. I actually took 3, this one I think I can see a line in but I'm not sure if I'm just going crazy? Its vvvvvf, more like an outline of a line but the other 2 tests I took have nothing like this! Am I pregnant? Confused!! Help!

Thank