Talk to Dietitian/Nutritionist on Too Much Weight Gain

Salam. My age is 21 and I got married on 18th of march, 2017. Before marriage my weight was 57 but now after 9 months my weight is 75 and thats horrible like my height is 5'7 its too much for me im trying but its not losing and Im also unable to concive even after every test of mine and husband everything is clear but still and my period cycle also got very disturbed kindly guide me. Thank you!