Hi baby pann nu, your spotting in week 5 could have been due to implantation bleeding which is really very normal. But since your pregnancy is in the early stages, it's good to take it easy if possible. Maybe sit down when your daughter wants to be carried?
I know it's hard I carried my son since the beginning of my pregnancy till now (33 weeks) and it gets tiring these days and uncomfortable too especially with pregnancy back pain! So whenever I can I'll sit down to cuddle him instead, usually during his whingey days.