9 weeks and bloated and gained 6 pounds

Hi all, I’ve never been fat but I already gained 6 lbs my clothes are snug on me and my belly looks rounded and I feel bloated all the time. I’m 9 weeks today, and just don’t like feeling like this. Isn’t 6lbs a lot of tk have gained so soon? This is my first pregnancy and I really am hoping not to gain more than 20lbs. I just feel uncomfortable. I didn’t think I would have to get maternity clothes so quick but I just might have to invest in some soon. My boobs hurt too, and are heavy all the time. I also haven’t had time to go to the gym lately and can’t always cook plus I’m starving all the time so let’s just say I’m not eating the best either. I have my first ultrasound on Tuesday and am so nervous wish me luck!!!