Body recomposition

How long is a few weeks, and how does that timespan line up with the increased exercise?

Muscle gain, sadly, is slow . . . quarter pound a week would be a good result for a woman under ideal conditions, and ideal conditions include a calorie surplus among other things. As you know, a quarter pound a week would be a pretty slow rate of fat loss, around 250 calories daily deficit. It's not very likely that a normal good rate of muscle gain will outpace pretty much any reasonable rate of fat loss, unfortunately. OTOH, increased exercise tends to increase water retention, and that's a pretty quick effect. It can hide fat loss on the scale, until the fat loss outpaces it.

Even my weight trending app thought I was maintaining, maybe even gaining, for around a month last year, when I was actually losing fat very slowly (intentionally slowly, in my case), but had resumed strength training (I always add a couple of pounds of water weight when I do that). Sometime the following month, the scale started slowly dropping again.

I wish I had a great answer for you, about how to know things are going OK. Tape measurements might give you a hint, since usually some of those will decrease if fat loss is happening, even with a little water weight in the picture. Other than that, the only thing I know is patience, and time.

If the weight loss gradually slowed as you stayed at the same calorie intake, it's possible that you've reached maintenance calories for your now-lighter body weight (the actual numbers should tell you how likely that is or isn't). If the stall was more sudden, and your daily life activity hasn't changed noticeably alongside the exercise increase, water weight is a strong possibility, IMO.

I visually guess my BF % based on pics of various body fat percentages from Google searches. I’m just as accurate as those Tana machines lol