Wtf!

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Well.....how much are you eating?

This.
Are you eating back your exercise calories? If not, you may want to consider doing so. Creating too large of a deficit can be counterproductive.

If you're eating 1200 calories, for example, with not eating back your exercise calories, you're eating way too little. Not saying you're on 1200, but that's what happens in probably about 90% of cases like this. 1200 is the bare minimum, but the user will be undercutting it to 1000 calories, plus exercising, and netting very little for the body to function on.

On the reverse side, are you measuring your food, or are you guessing your portions? You could be underestimating how much you're eating, and actually eating more than you think.

There's all sort of factors involved, but opening your diary would be a good step to get some constructive feedback.

Get your scales checked. they could be innacurate. If you don't have tiny scales that weigh even in single grams, get some.

Editing: I mean kitchen scales. But hey, bathroom scales might be skewiff too.

What's your height, weight, and age?

Are you logging everything (even condiments, coffee creamer, etc.) every day? Do you use a food scale?

What's your calorie goal?

Do you mind opening your diary?

1. How many calories are you eating?

2. Do you use MFP to log your exercise, then eat everything back? The estimates this website gives are very generous. I recommend cutting back to 75% of those earned calories.

3. Do you stay at or under your calorie goal every day or most days? If you go over sometimes, how often and by how much?

4. Do you use a kitchen scale? Eyeballing or measuring non-liquids by volume is inaccurate, and you could be consuming a lot more calories than you think.

5. Have you been tested for any thyroid or other conditions that could affect your weight?

6. Are you on any medications that make weight loss difficult?

7. Are you drinking any calorie-filled beverages, such as soda, juice, milk, or mixed coffee drinks, without accounting for them?

I doubt that this problem is caused by under eating. People will throw around the whole starvation mode thing, but you typically see adaptive thermogenesis (a preferable term over starvation mode) in people who have been at an extreme calorie deficit for a long time and have stopped losing weight. Those people absolutely lose weight at first, but it slows or stops further down the road.

well if something is not working then change it up.. You should be doing weights, push ups, planks as well
as cardio.. Eat less exercise more, pretty simple.

Your ticker shows 5 lbs lost-- was that during this month?

I was having this issue myself... And found that I was not accurately tracking my calories. Some days were so far under that by the time I exercised my NET calorie intake was 500-600, or I was over estimating my calories to the point where I was actually eating at maintenance instead of a deficit. You really need to track the calories closely, weight and measure everything. It takes a little extra time, but it does in fact make a difference!

I'm 5'4 and 30 yrs old. MFP says I need 1500 cals a day. Yes I log everything. Most days I'm at a deficit of 100 calls or so. I don't have a kitchen scale, but I'm being pretty accurate. I've lost 100 lbs before and I did it by basically starving myself and working out while my husband was in Iraq. I don't worry too much about carbs. Everything I eat is gluten free, fresh produce, and whole grain. I never eat anything processed or out of a package. Except bottled water.

Have you been checked by a doctor for, or do you have any medical conditions that affect weight loss (PCOS, hypothyroidism, insulin resistance, etc.)?