Weight concern!

My LO will be 6 weeks on Friday and I’m just concerned he is not gaining enough weight. We are exclusively breastfeeding and I’m starting to think I’m not producing enough! Last week he weighed 8.6 and this morning he was 8.3 on our scale at home. He is not showing signs of hunger, is happy and has tons of wet and poopy diapers daily 🤔 is this weight loss something I should be concerned about? He doesn’t see the dr till his two month appointment in December

Thank you!