Does taking different a levels after first sitting count as a resit?

Clearly they aren't resits as you haven't done them before.

From what you have said you are in year 13 now and will be starting the two new A-levels next year? So you wouldn't be able to apply next year as you would need to apply the same year you are taking the final exams for the new subjects. Same reason you can't apply in year 12 to uni...

Thank you for your answer! So, let's say I want to apply to somewhere like UCL for medicine, would my application be regarded the same as everyone else's (considering I pass the entry requirements) or would taking another year with dif A levels affect my application? It's just that I don't see many cases like this at all and I'm really not sure how smoothly things will play. One of my friends said that it would put me at a disadvantage.

To preface, I want to apply to medicine because I want to get into psychiatry. I am aware I can get into a psychology course and then do a medicine course after completing a psychology degree. But, that takes a long time so, it's my plan B.

Plan A, I'm about to take my A-level exams in 2 weeks (Psychology, English and Maths) and I'm already set for a 2-year A-level biology and chemistry course starting this September. But, anytime I research anywhere about taking different A levels after my original A levels, the only thing that comes up is resits. So, I'm confused about whether uni resit policies apply to this situation (I know different unis have different resit policies).

I was taking physics as well (cuz I was going into engineering) but, my teachers convinced me to drop it since I had changed career aspirations, which I very much, deeply regret since someone here mentioned some unis accept a science with a pending grade for chem or bio.

My question is, would I still be able to apply to medicine at the end of year 13 with my current A-levels with a conditional on what I get in chem or bio (granted I get AAA my first sitting)? If not then the second question is, would uni's treat this as a resit/re-enrollment?