Afraid to believe I'm actually pregnant

I have been tracking my ovulation for the past few months on the glow app and so I'm aware of my fertile days. My boyfriend hurt his back this month and because of that, sex on my most fertile dayswas a no-go. But on the last day of my fertile phase, when chances of fertilization were about 7%, we were able to have sex. Fast forward a week to one week before my expected period. I had a very minor moment where I felt slightly queasy and dizzy. Nothing is worse than obsessing over whether or not you're pregnant so I decided to take a pregnancy test... and it came back positive! I experienced happiness at first, but then I grew really doubtful for some reason. Like as if there were some kind of error with the test. I took another one and that was positive too. So here I am a week later, barely 4 weeks pregnant, not feeling a single pregnancy symptom, wondering what in the world is going on. The test said positive, so why am I so reluctant to accept it?