Short and light period / TTc for 6 months

My period this month only lasted two days. One day of dark red medium flow (only one pad was enough all day) and the second day spotting only when wiping. It was regular 28 days but It’s really weird as my flow goes for at least 4 days. The doctor said it could be related to stress :( and lost of weight. Anyone experienced this and got different opinions? Is it bad when TTc to have such a short period? Does this mean i didnt have enough uterus lining or something?