Late period due to weight loss

I've gone from being around 86kgs to being 65kgs in the past six months. The first two months my period was on time and the flow was regular as well, but in the third month the flow decreased and now my period has been missing for three months. I tried visiting a dietician who said that this was normal if i had lost a lot of weight, and now i have increased my intake as well but do try to remain in a slight deficit and workout. I think because i lost weight so fast my body didn't have the time to adjust hormonally. what do you guys think i should be doing or should i just wait it out