Eating 1200 calories.... too low??

People on here are constantly saying that 1200 calories per day is too low. After dieting unsuccessfully for so many years I wanted to do it the 'proper way' and eat healthy and exercise to lose weight rather than diet. I had thought that 1200 calories was an okay amount to eat and that going below that was unhealthy.

I eat around 1200 calories per day and have been doing this since May. One month, I think it was August, I ate less than that but that was because it was Ramadan and I was fasting. I exercise 5-6 days per week usually and I can honestly say that I do not feel hungry at all with the amount I'm eating.

I haven't binged so far and only have had one real 'cheat day' (after 4 months), when I ate around 1600 calories. This works for me; eating more than I am currently would just make things very difficult for me as I sometimes struggle getting 3 meals into my day.

I'm really petite (under all my fat!), so I don't think I need as many calories as others. I'm only 5'2'' tall and have a very small frame. Eating this amount I'm losing around 4-5 lbs per month which really isn't super fast weight loss at all. One month I lost just 3 lbs. If I were to eat more than 1200 calories, I wonder if I'd lose any weight at all and also like I say I don't feel hungry at all eating the amount I am. I had planned on increasing it if I felt like it was too less for me; the last thing I want to do is end each day hungry.

So is it unhealthy to eat this amount? Should I increase it right away? What are your thoughts?