Confused

Got a very faint positive almost a week ago using ept. Today used first response and got a negative. Haven't had any bleeding in between. My symptoms are still the same-bloat, heartburn and burping a lot, all of which I never get. I get full pretty fast, sore boobs, darker areolas, queezy throughout the day and very tired.  I had my "period" a few weeks ago but it was lighter than usual and it just didn't feel like my normal period, it was 5 days late too. I should be halfway through my 7th week if I'm pregnant, so shouldn't the test pick it up by now? Or maybe I'm not, but I've never felt like this before. I don't have any desire to drink either which I usually would have a drink or two every day. I've heard stories of women who have some light bleeding ewrly on and mistake it for their period, or they don't have enough hcg hormone to stop the period completely or show a positive on a hpt. Other women don't get a positive until they're 9 or 10 weeks, some don't get one at all their whole pregnancy until they go to the doctor. So idk what I should do, what do you guys think? My bf and I don't use any protection and I'm pretty sure I had sex while I was ovulating