Alhamdulillah you're managing ok! 5 weeks tu memang stage ni badan dah mulai adjust dengan perubahan, so back pain and bloating is totally normal lah, a few of my mum friends said mereka pon dapat symptoms sama dalam early pregnancy. Just make sure you're sipping water enough when you break fast, rest when you can, and jangan stress sangat about it. If the pain gets really bad or anything else worried you, definitely check with your doctor ye, tapi kalau cuma mild discomfort, you're probably fine to continue puasa!