One child

Anyone ever thought maybe one is enough? I recently had a late miscarriage at 22 weeks, and ever since have been pulling my hair out ttc. Am I wasting my life waiting for something that may never work again? And being very ungrateful for what I have? I have a amazing nearly 3 year old, he is my world, do you think I should just be happy with my luck and not spend my time trying? I don't know, or am I robbing him of having a sibling? Xx