weight gain this early?!

By 5 weeks, I had gained 5 pounds! Now at 7 weeks, I've been so sick I've lost those 5 pounds lol 

Bloating most definitely. Your blood volume has also started to increase which means more weight. I bloated up from weeks 5-now (almost 7 weeks). I had gained a kilo in that space of time (2.2 pounds). I've weighed myself today and I am back to what I was pre pregnancy. For some it's temporary, and the real weight packs it on from around 10 weeks, for others they put it on early and stay the same even up until 14 weeks. There's so many factors (blood volume, slower digestion so good staying in body longer, constipation, are you drinking water how you should be and maybe weren't before being pregnant, are you vomiting regularly, are you eating less or more than before, are you exercising less or more than before). I wouldn't worry too much at this stage. Just keep an eye on it, excessive weight gain can bring extra problems, but they usually dont cause a problem until further along. :) 

I'm bloated too, it sucks.

I'm bloated as well. I look like I'm about 5 months into my pregnancy and I'll be 6 weeks tomorrow 

Oh yes probably bloat and water weight!

I'm only 6 weeks and 3 days. They thought I was further along until they did the ultrasound on Friday. I've got a small baby bump already just from bloat and constipation, but thankfully I haven't experienced many other symptoms yet. I was prescribed miralax and it helps quite a bit when I mix it in hot tea. Good thing is you can get it OTC and it never goes systematic so it doesn't effect the baby.

I'm 4 weeks today and I've gained like 5lbs already so I feel ya! I'm so confuuuused the baby is the size of a tomato seed so I'm like ???? Whaaaaat