Hi mama! Grade 2 placenta at almost 30 weeks is actually normal, it just means your placenta is maturing, which is what should be happening at that stage of pregnancy, so don't worry! I'd still mention it to your OB during your next visit just to have it on record and get their reassurance, pero from what I know and from what a few of us moms experienced, this is nothing unusual at 30 weeks pa lang. Enjoy your pregnancy, you're doing great!