Ay, mahirap talaga yan, lalo na pag heavily pregnant ka na! Honestly, lying down a lot won't hurt baby, but that back pain needs checking with your OB kasi pwede ding sign ng something na kailangan i-address, a few of us moms realized na proper pillow support and positioning actually made a huge difference, or sometimes it's just the pregnancy stretching everything out. Try sleeping on your side with a pillow between your knees, at baka kailangan mo ring prenatal massage or stretching exercises na safe (pero confirm muna sa doctor mo ano exactly ang nakakasakit). Kaya mo yan, mama!