Well I did my rolls for Ningguang and Beidou and did indeed, end up getting Tartaglia while I was at it. I was gonna just do rolls for 1 of each, but decided to try for at least 1 constellation for each of the two, which I did end up doing. Now I'm at 30 rolls until the hard pity for the next banner. Actually pretty satisfying to finally be able to use my rolls I've been saving up.
I'm not sure if your luck is better or worse than mine. I didn't get Tartaglia, but did manage Ningguang, 2 Beidous, an extra Noelle, Diona, and 2 Xingqius in 20 rolls
On the other hand, the new main quest boss is kicking my ass