I lost 10 pounds the first week of my diet?

So i lost 10 pounds the first week of my diet without even trying....the goal was 3-5 pounds and it was with the ideal protien diet.....i ate about 1300 calaories a day and ate alot of protien.....for brekafast i would have protien shake detox tea and vitamins....then i also ate lunch and dinner and that consisted of chicken/fish with veggies....i drank alot of water and i had to pee alot probably from drinking detox tea 2 tjmes a day....i was 220 and im now 210 and im 19 years old....is this unhealthy for me? I was overweight but the goal wasnt to loosr 10 pounds in one week....i was aiming for 3-5....is this unhealthy for my body? I mean i still age and was almlst never hungry...btw this diet does not allow working out