It is good to hear that both of you are so conscious of your body weight at such an early age. You have lost a good amount of weight (ideal weight reduction when on a diet and exercise should not be more than 2 kg. per month). You can continue on that. Added to this, you need to get a thorough investigation for infertility; hormonal
assays, tubal patency tests, sonogram, a general examination, partner assay and so on. Some conditions cause excessive weight gain
and before you can get a reasonable weight loss
, they need to be corrected. consult your doctor for further advice. Good luck.