Bfp after "period"?

Has anyone ever gotten a positive days after a "period"? This is how it went for me. My last regular cycle (I'm very regular at 34-35 days) started Mar 23. Lasted 7 days, as usual, cramps and heavy heavy, as usual. We go on about our month. No protection, but not having a crazy amount of sex. Some during my fertile days, per Glow, and the last time was the day my period was supposed to start, CD34. But it didn't start. It was actually 9 days late. During those 9 days, I took 5 tests, all negative, the last being the day my "period" actually came on. I keep putting it in quotations because it was a bit lighter than normal, I didn't cramp as bad as I usually do, and it only lasted 5 days instead of 7. Then, a couple days after my period ended, I started waking up around 5 and 6 am from being nauseated. Which has never happened to me, not even in my first pregnancy. The nausea stayed with me all day. For 2 days. Then the 3rd day I took a test because it was all so weird. It was obviously positive. That was Wednesday. I have taken a test every day, they are still just as positive as the day before, not getting lighter. So I just am trying to not get my hopes up in case I'm miscarrying. I guess I'm wondering if anyone else has experienced anything similar? I am still having some nausea, periodically throughout the day, especially if I'm hungry...and also if I'm full...which is annoying. And I have in the last day or so developed tender nipples. Just trying to figure out what this weird uterus of mine is doing. 😂😂😂