It's not that waiting is impossible, but it's not something you should leave without attention indefinitely either because dental infections can get into the root and get pretty complicated. While you're saving up money, the best thing is to avoid biting hard on that side (like you're already doing), keep the area clean with good hygiene, and if the pain is really intense take common painkillers, but watch out because that just masks the symptom. If at any point you see the gum swelling up, turning red, or you get a fever, then you really do need to go to a dentist urgently even if it's a cheaper one or a university clinic where they charge less, because that's already more serious.