Latching and feeding time

My girl is 2 weeks old she is stuck getting weight checks every week...when she was born she was 7lbs 6 oz well this past tuesday she finally hit 7lbs and have to go back next week for another weight check. It has really ruined my confidence with breastfeeding making me feel like I’m

Not feeding her enough...she latches on and will feed for an average of 15mins...she’s never fussy just in the evening every now and then. Any advice? She’s peeing regularly and is pooping regularly for the most part. It’s all in my head I’m sure