You don’t have to celebrate on the actual day. You could celebrate the weekend after, maybe go out for dinner or go on a cute date or activity as @aurielle said, might be nice to use the excuse to celebrate finishing your exams at the same time too!
My boyfriend and I are also only recently together and we’ll probably just go out for dinner, we’ve been talking about going away for a weekend so we might just celebrate then either if we end up doing that soon.