crazy weight gain

So I am knocking on 7 weeks preggers and I weighed myself today ( idk Why 🙄) and it shows that I have gained like 7 pounds in the last two weeks! What the heck, With the exception of a few times (gave into cravings)  I have eaten really healthy for the most part and maintained my water and fruit juices. I am eating more ( because I get nauseous if I dont) but I try to make sure its a healthy snack at least. I dont get it. Did this happen to anyone else?