Baby's sleeping

I'm a mother of five kids my youngest is 3 weeks old my four Boys are way older my youngest son is 12 anyways with my pregnancy I've been so paranoid of everything it's like my first baby with her and now she's born everything she does I Google it to see if it's okay if it's normal well my issue is now how she sleeps she does not like sleeping on her back I put her on her back and she wakes up on her side I try pretty hard down on her side and she sleeps longer and profitable but it's not safe to put her on her side I was reading it also says don't overheat the baby it's very cold I put her and two blankets to keep her warm am I overthinking this ???