Ay, congrats sa baby mo! Honestly, it's pretty normal to have irregular bleeding when you just started the pill, lalo na kung 4 months pa lang postpartum ka, your body is still adjusting talaga, especially if you're breastfeeding pa. A few of us moms experienced weird spotting or heavier flow in the first few cycles ng pills, kaya don't panic! But if the bleeding is heavy, won't stop, or you're feeling unwell, better check with your OB para ma-rule out anything else at ma-assure ka, they can also switch you to a different pill if needed since bawat katawan ay different talaga.