3 month old won’t nurse after surgery

I had my tubes removed this morning and was told by the anesthesiologist that I only had to pump and dump one time and I could continue nursing regularly after that. She mentioned there were a lot of mixed reviews - and I have seen that for myself on here and online - saying that some would recommend pumping and dumping for 24 hours, some said 12 hours and some said as soon as you wake up and can walk around you should nurse. It seems like no one really knows anything 100% on this. Well I went ahead and pumped and dumped the one time like the anesthesiologist said, so my baby had 3 bottles all together while I was gone which really doesn’t seem like much. He has a bottle (2-3 oz) every time after he nurses anyways during the day (not at night though) to help him gain weight because he’s been kind of flatlining and not even following a growth curve and this bottle after nursing has finally helped him to reach 9 pounds at 11 weeks old. His diapers are finally wet and not just damp and he’s pooping at least every other day now. He seems much more content and sleeps better and is finally reaching milestones so it seems like we finally found something that worked for us. But now that I’ve had this procedure done today he doesn’t want to nurse. It’s been about 5 mins on each side and he already decides he doesn’t want anymore but will cry and show hunger signs so I tried to put him on my breasts again and he won’t take it. Is this normal after a surgery for them to not want to nurse? Does it make the milk taste funny or is he just preferring a bottle after the three he had to have in a row? Two of those three bottles were expressed breast milk and one was formula but does that even make a difference? I’m really proud of us both for making it this far, he’s my 4th and final baby and the only baby I’ve been able to make it this far with breastfeeding. My other three didn’t go past two weeks so I’m not giving up because he is my last and I won’t have another opportunity to try and make this work.