Has anyone just exclusively pumped from birth?

Hi all, new FTM of an 11 day old and feeling extremely touched out with breastfeeding 😮‍💨am really not enjoying it at all, baby struggles to latch, falls asleep on boob and it’s a lot - I don’t know whether to continue at the moment.

He also lost 9% of his birthweight on his first weigh, so we’ve been topping up with formula (and breast feeding) - which is easier, and means my husband can get involved. However, I seem to have a good supply and have started pumping.

Has anyone exclusively pumped and then bottle fed only, did it work? How much did you express or aim to express in those first few weeks??