11wk and lost 9.8lbs

Amanda • Trying for baby #3!
Is it okay to have lost nearly ten lbs in the last 4 weeks. I have been snacking all day long and eating 3 meals a day but the weight just keeps coming off. In the last week I've been losing between .5-1 lb per day. My nausea hasn't been too bad but I'm worried about the weight loss. Just for background I am 5'9" and weigh 170lbs. BMI 25.1