Have you seen the spots reduce at all or have they progressively increased? The reason I ask is that ich has a 3 day cycle where they'll actually detach and fall off to the sandbed so it'll actually look like it's getting better without you doing anything, but really they're just breeding and will reattach in fuller force. However, if it's just getting progressively worse, it may be another type of parasite like velvet. Since you just noticed them this weekend, it may still be early enough to try ttm, but if you're worried, you can always try copper.