Tiny baby weight gain obsession!

I'm obsessing over weight gain!

My baby surpassed birth weight by week 2 and was in the 8th percentile at week 4.

On week 7 she was weighed and in the 5th percentile.

She is mostly breastfed, and the nurse told me to try expressing after feeding and then offering a bottle because of her weight, but she refuses the bottle after breastfeeding.

I'm very small! I was in the 1-2 percentile my entire childhood, and she's hitting all milestones and is a very happy baby. She has 7-9 wet diapers and 3-5 poops per day. HOWEVER she only feeds 5-15 minutes total per session. She sleeps up to 5 hour stretches at night. I'm still stressed about her not eating enough. How do I get to her to eat more if I feel like I'm force feeding her? Do I need to force feed her?

Looking for people who were in a similar situation...