Worst time of my life!!

March will be 3 years ttc! My husband and I already have a healthy 5 year old but baby #2 isn't so easy!! I've don't just about everything! Been back and forth to the docs everything is fine in there!! I've tried every vitamin, preseed, ovulation tests every month. I'm getting so discouraged and disappointed EVERY month! My son is constantly asking for a sibling and it breaks my heart! I tried every day this month and of course my cramps are kicking in and I know I'm getting my period 😔 idk what else to do!