Aiyoh, I feel you lah, trying for second baby is such an emotional roller-coaster, especially when the first time took so long and then you lost it. Stress and anxiety can affect your cycle, tapi 4 months of trying is still quite early, so please don't blame yourself yet. My advice would be to see your doctor or a fertility specialist soon, they can check if there's anything physical going on (hormones, blockages, all that) and give you peace of mind, because at least then you'll know what you're working with instead of just wondering. A few of my mum friends who went through second-baby struggles found it helpful to talk to someone (counselor or doctor) about the anxiety too, because sometimes our bodies hold onto stress. Hang in there, mama, you've done this before, your body knows how.