I honestly, truly think you’re fine!!! Your lines look GREAT!!! Especially that last set there!!! I mean that’s DARK and waaaaay darker than the previous!
I know the red blood is scary but it can be anything from a cyst, to irritation of the cervix, to implantation, to even a little hematoma.....or the ever popular and forever comforting “no medical explanation” and all end up just fine! If this current baby makes it to term (knock wood!) then I’ll have bled allllllll the different colors of red one can have and had two successful pregnancies. So it can happen!!!
Will be praying for you and wishing you all the good luck!!!!