will i make my goal?

im worried im not going to be able to keep up with this breast feeding... while im at work he will take 3 5-7oz bottles and then in the evening at bedtime he cluster feeds so much(on days im home in evening) that i have to give him another one. Plus he eats off of me several times so unless it early morning or the one time i can pump at work(every once in awhile at bed time) i dont get to pump. Im barely pumping to cover what he takes in bottles(most days). It almost like he threw in an extra growth spurt because he wont stop eating. Its all cluster feeds!! It was slower a few days ago... plus he started showing teething signs and is doing extra comfort sessions. When im home it feels like he only off me small chunks of times. Other days its different though where there big gaps between feedings but all the feedings are still big... I really want to make it until atleast 5 months but what are the odds at this rate that im going to be able to?

also i should mention right now my son is only 9 wks old

the other things that worries me is as hes increasing his eating(esp bottles while im at work) he now spitting up chunks again. He is not crying in pain so i know the zantac is doing its job. Does anyone have any support or advice to go with any of this?