Why can’t I shake the weight?

The weight on the scale swings a bit even if you do everything correctly. You want to look for an overall downward trend over time.

Patience and consistency are needed. You don't have to be perfect. If you fall off the wagon, just get back on and keep going.

I don't know if 1900 calories are a deficit for you, especially since accurate calorie counting takes practice. Give things at least a month and then reevaluate.

Nutrition is always important but, for weight loss, the thing that you need is to consume fewer calories than your body uses. Eating "healthy" isn't a guarantee of a calorie deficit and neither is intermittent fasting. Exercise is good for overall health but, once again, the necessary goal for weigh loss is a calorie deficit whether you exercise or not.

PCOS and medication may alter appetite and/or how many calories your body needs to maintain weight but consuming fewer calories than your body uses will lead to weight loss.

To really know how much you are consuming. Use a food scale, and everything you put in your mouth weigh it first. Use the food search, make sure it is accurate the USDA ones normally are some are really wonky as incorrect.

Log every piece of food you eat, no skipping, no estimating. Oh and that also includes any oils, butters, sauces etc you use to prep food. It all counts.

How to really know for yourself what is the calorie number to shoot for, both on MFP and so many online sites. You can input your height, your weight, how active you are or not, normally your age and out comes a number for calories. Also many will ask you how many pounds or how you want to lose weight like slow, moderate intense etc. Here on MFP the most is 2lbs a week.

The goal or so it is said for exercising per week is 150 minutes. It can be done over several days.

Key is consistently we must be consuming less calories, than the body needs to just get through the day. Lots of info on the internet and here on MFP about this. I think a key thing is to really read up on some of this for a better understanding.

Weight loss is an up and down event. If you start exercising more than what you had been, then you can get some temporary water weight gain, work through it, it will come off. I track mine also on a spreadsheet and it sure shows the ups and downs.

Agree medications and some chronic conditions can have big impacts, but there are ways we find to work around this.

This is nothing more than a suggestion, but look at some of the challenges maybe they would work for you or maybe they will not. For me in 2018 I joined the one for losing a minimum of 5 lbs each month, almost every month I beat it. But it helped me be accountable. And also picked up some good tips.
I started at 305, got down to 228. Then stopped, my bad. Gained some back, and now I am back logging, and doing the challenge.

You can do this ladies no doubt about it.