Is my metabolism slowing down?

So all my live I have been small. I still am, but lately I’ve been gaining more weight than usual. And before anyone is like “shut up you’re still skinny” you don’t know me, and I’m just wondering if my metabolism is slowing down, not if I’m “bigger” lol.

Anyways, I am 5’4” and have been around 106-109lbs for most of my adult life. I am 25. My weight always fluctuated from like 105-110lbs for all of my adult life. Got pregnant, got up to 140lbs (normal)

Last week my weight was 112lbs.. okay.. cool

Today it’s 117lbs. What! I haven’t weighed that much in.. ever. My stomach has been a little bloated lately.

So... I’m wondering.. should I cut out the junk food now? I’m just afraid I’ll ignore my weight and it’ll just go crazy.

What are things I can cut out? I have been bloating a loooot lately. And I don’t have the best diet (at all)

Also I weighed myself at the end of the day.