Having a hard time

My husband and I have been trying to get pregnant since February when my postpartum cycles finally came back after 15 months. Doing opk and had sex the day before and day of ovulation this cycle. My literal phase has been 12 days long since I got my periods back. Well today at 12 dpo I tested negative. Period is due today. I just feel sad. Everyone around me that started trying around when I dis is already pregnant and I’m still waiting. I know I am lucky to have my son but it’s sucks struggling to give him a sibling. 😔