How do You get the umbilical cord if sent ti clinic, and does it still count towards the alternate optional boss

well i already killed more than 3 bosses and I was going to kill Rom when I remembered that I didnt had Arianna so I went where she is and instead of she speaking to me there is a man how gave me the Tonsil Stone so I dont know that I did wrong.

I accepted arianna's blood vial and she is not in the sewer.Where is she?

BSB is not the trigger for Arianna to go to the chapel it is just 3 bosses, mentioned above you say you killed 2 but you didn't count Cleric beast, I got her to move to the chapel after killing Cleric, Gascoigne and Vicar Amelia (kilied BSB after Amelia), which after defeating Amelia I went to talk to Arianna and she moved to the chapel

Finding Arianna in the sewers behind Central Yharnum suggests that she's in the sewers with all the rotting flesh men or whatever and the giant pig. This is heavily misleading as Arianna is found nowhere near where it's suggesting. Wiki should state she's in the sewer pit leading up to the Cathedral Ward (lamp).

I killed rom and it says no response and i never talked to her i have 3 cords: wet nurse, workshop and the clinic what do i do?

To find her through the description in this page, you'll need the Chief Hunter Emblem, it's through that gate, then left.

Well i have 2 cords and i killed iosefka befor the bloodmoon and i never talket to arianna so she os not in the chapel can anyone help me? XD

It made such cute sounds and had little wings and was looking at Arianna like recognizing its mom. I felt bad about killing i