Will a few extreme low calorie days effect my weight loss?

I have had a manic last couple of days and physically not had time to eat enough, and really only managed to consume around 900 cals per day over the last 2-3 days. I usually eat the right amount of cals (approx 1400) and I just wanted to know whether these 3 days of low cal days will effect me or not, even though I am going back to eating the right amount now, or is 3 days just not enough to effect me? or should i be eating extra to make up for the lack of calories in them days?