Ay, first time mom worries, alam ko yan! Subchorionic hemorrhage sounds scary pero marami sa amin na nag-experience nito, ang kaibigan ko nag-bleed din around that time at okay lang siya at ang baby, kaya hindi ka mag-iisa sa concern na yan. Best talaga na i-follow up with your OB agad para ma-monitor properly, lalo na may bleeding involved, kasi sila lang ang makaka-assess ng severity at ano ang kailangan mong gawin; regarding the heart rate, that's also something para sa doctor since each pregnancy is different, pero sounds like normal questions for your next checkup where they can put your mind at ease. Hugs, mama!