4 weeks - brown discharge, back aches, and passed some tiny piece of tissue :(

*update : brown.discharge and tissue stopped and lines are still darkening so.we shall see lol My HCG is at 329, but my progesterone is at 8.3) Any chance someone had these and still went on to.have a successful pregnancy?

^Here are my lines so far, I've had on/of back aches/cramping/pain for the past few days - but yesterday afternoon (15 dpo night) I passed a tiny piece of tissue (smaller than my pinky nail) while I peed, and then later i seemed to start having a little bit of brown discharge when I wipe and on a pad. Then when I tested again last night, it was lighter 😭 My last pregnancy ended in a MC at 5 weeks, so obviously my brain jumped to the worst and is expecting it - but it's been hours and.while my back was aching so much I assumed I'd start bleeding out, I haven't yet and there's no sign of new blood anywhere. My back settled down, brown discharge is still there but a bit lighter, and i haven't passed anything else. I tested again just now (16 dpo fmu) and its darker (though could be due to concentration vs the diluted one of last night). BUT, its almost darker than all of them, which gives me a tiny ounce of hope that maybe a tiny piece of my.uterus just didn’t want to be here and the pregnancy is fine! :'D Lmao ugh. I'm not religious but damn am i praying