Eating more and losing weight ......... losing it fast, too fast :S

Don't be too alarmed, or too surprised. And yes, assuming your logs are accurate, I would increase to 2K with the intention of slowing things down.

Your initial loss (depending on when in February) is coming back at MORE than 2lbs a week. I don't know what you actually logged as intake (what you aimed to eat matters much less than what you ACTUALLY ate), but it seems likely that a 400 Cal increase (500 Cal corresponding to 1lb) won't bring a rate of more than 2lbs down to 1lb or less. If you were eating 1400 and losing at more than 2lbs a week, your maintenance calories were more than 2500

You are also quite likely to become more active and exercise more vigorously (with more energy) as you're feeling good because of your weight loss so far, and fuelling yourself at a higher percentage of what you need to maintain, i.e. your calories out may have increased as compared to before (so even higher than previous which was at least 2500).

However, there exist potential confounding factors: some water weight MAY have been released with a reduction in the stress your body has been under. you may also be "benefiting" from time of month hormonal water weight balancing in terms of using your current loss rates to establish your current calories out.

In general I prefer to make my decisions based on weight trend results as opposed to discrete scale weight results. While weight trend is not ALWAYS more correct than scale weight, MOST of the time it is. You can use an app or web site to establish a multi week trend if the "general" statement of "your TDEE looks like 2500 or MORE" is not precise enough for your needs!

In any case. moving to 2000 at this point seems very conservative if anything. In fact moving to above 2K would also seem reasonable as your current TDEE is clearly above 2500 (as mentioned, potentially appreciably higher than 2500 based on recent losses while a base level of 2500 has been substantiated based on your previous losses)

I mean other than temporary blips as you start to eat a bit more anything below 2500 would still be a deficit... and you can keep adjusting.