how late did you get assigned to a doula ?

i have been trying to get one since 30 weeks, im about to be 39 and they finally called back to try and give me one which is good! my question is should i still go through with it ? i wanted more time to get to know her and now i feel like she’ll just be there when i deliver and just have that title of a doula but won’t even know if i like her or if she’s the one for me and my boyfriend to help us in the delivery room. i kind of considered having my close family friend (been there since i was born) instead be in the room with us now because it’s 2 people max and she brings us comfort and things like that. but now i’m conflicted if i should just have a doula. ftm and i’m 22 lmk how late you were assigned a doula, if you got to know them and if they made you feel comfortable. thanks!