Any time you increase your calories from a period of restriction, particularly if you increase them eating carbohydrates, you will go through bloating and water retention. Bloating, usually visible only to the 'owner' of the bloat, will cause you to feel uncomfortable. Water retention will put pounds on the scale. They seem real, but they are not, really. Women often hold 7-10lb of water weight thanks to the increase of hormones around their period, and then it dissipates.
In your case, both will go away, if you continue to eat normally and drink water. However, if you eat 3000 calories and then restrict in guilt (or fear), you will continue this cycle for as long as you eat then restrict.
I know y'all are tired of hearing the 'eat 2500-3000 calories until you are PAST your desired BMI' -- but part of doing that helps you get past the bloating and water retention.