Feed timings

We have recently switched to EFF and coming from chaotic nursing timings generally I can definitely start a bit of a pattern emerging - ie. baby now goes roughly 4 hours between feeds, however the nighttime has completely changed. She used to wake up at exactly the same times each night when nursing and my body has absolutely adapted to it, however now the timings are completely different and also each night the wake up times are different because there will be one random feed in the day which will be 3 hours instead of 4.

It has only been two weeks and I appreciate that babies dont necessarily run on schedules like robots, but does it eventually settle into a predictable pattern with formula? I find that I am still waking up in my old nursing times and then just lying around awake for ages stressing about when I need to run down to warm up formula (I try and listen out for her stirring and do it in advance as otherwise she hungry screams - with breastfeeding it was just a quick pick up from the cot into our bed).