Getting pregnant

My husband and I have been trying to get pregnant for about 5 months now. I have a 3 year old from a previous relationship, so I know I can get pregnant. About 6 months ago I had my iud removed. Since then my cycle has only lasted maybe 2 days at most. My husband thinks that's the problem but glow says my ovulation days are normal, and my doctor dosnt seem to be worried about it.  I'm getting frustrated! What do you think?