Nursing

Hi ladies, I’m a FTM & my daughter is 7 weeks old.. she is always wanting to nurse.. The first week or two of her life, I had to supplement formula because I wasn’t producing enough for her.. recently she always wants to be on my boob. Which doesn’t bother me, but I’m afraid she isn’t getting enough to eat.. I always try to give her a bottle of formula but she spits the nipple out of her mouth or gags. I’m just becoming stress. Before I give her the boob, I ALWAYS try to give her the bottle, just so I know she’s eating, but like I said, she spits it out or gags on it.. also, she won’t take a pacifier & it’s hard to get anything done because she constantly wants to be on my boob, any advice on how to reduce how much she’s nursing?