Don’t worry @68degreesnorth, I probably spent a similar amount to you!
I started to outgrow my regular stuff at about 12 weeks and now at 38 weeks have only two dresses in my normal wardrobe that fit (and they are pulled up oddly).
I’ve bought maternity tights (old ones painfully tight) and a couple of pairs of leggings (I don’t normally wear them so not sure if regular ones would fit). I’ve bought a long top to go with them (also breastfeeding friendly).
Also bought maternity bras and knickers - outgrew my old bras by about 8/9 weeks…
I also bought a winter coat (but second hand from eBay) and a swimsuit. I’m almost due but don’t regret either of these; the coat will also be fine to wear post-pregnancy and is in great condition.
And I bought five dresses - two more summery and three more autumny. And one skirt.
For me, I’ve found these fit far better than just buying things in a larger size, but I think probably depends on your body shape to start with. I have very narrow shoulders and short arms, so am easily swamped. Definitely you could do it cheaper, but I’m planning to keep all this stuff for (hopefully) a second and then I’ll sell it on eBay afterwards.