No f*ckin way! Really?!

So my period according to glow is a day late, but glow has been off every month by a few days. I was at Walmart and I went to buy tampons and walking past the preg. Tests and saw one for 8 8 cents so I picked it up for the hell of it. This morning I took the test not expecting anything waited a min and then the one line came up so I put it back in the box and thew it away went and put my pants on and read the directions for the test ir stated wait 3-5 min for full results. So I took it back out of the box (5 min from taking the test) this is what I saw! Am I really pregnant I'm kinda freaking out. We were not trying but not preventing. Rite now we have a 5yo son together and we have an angel boy who was stillborn 2yrs ago. I just have

No symptoms and I don't feel pregnant. With my last 2 I knew I was pregnant before I even tested. I'm completely in shock.