Will I get my period back after weight loss?

Yeah, it'll come back. I lost my period from an eating disorder when I went from 45kg to 35 kg (5'0 feet). I recovered and got it back when I reached 41 kilos. It might take a month or two extra to come back, but as long as you are the right weight for your body, your period will come back. You might notice a difference in how heavy your flow is and how long it lasts. Look out for brown discharge, it usually comes within the proximity of a period.