What is wrong with me

My fiancé and I started ttc last November, 3 months later we got pregnant just to miscarry that following month. Before my chemical pregnancy and after my chemical, my cycles have been extremely wacky and irregular and very painful. We’ve been trying to get pregnant again since the cycle after our chemical but no luck. I made appointments with my OBGYN and got all my hormone tests and an internal ultrasound and everything came back normal. I’ve been off birth control for two years so no idea why my periods are so irregular like they are and it’s getting very frustrating. I’ve been diagnosed with mittelschmurz (ovulation cramps) so I know I’m ovulating every month and my doctor told me so too. I just don’t understand why it’s going on 9 months since my miscarriage and I’m still not pregnant yet. I don’t understand what I’m doing wrong 🥺 does anyone else have any similar experiences or tips for what to do? All I want to be is a mother and I got pregnant so quickly the first time... So don’t know why it’s taking so long now 😞