Why don't I look pregnant?

So I am officially 10 weeks pregnant on Wednesday and I don't even have the slightest baby bump. It worries me because if I am carrying twins you would think I would see something. I haven't had an ultrasound in 3 weeks so I am a bit worried. I guess that is just the way it is going to be all along. I will not be able to "relax" until I am holding the babies. I actually feel like I have lost some weight, if that is possible. I have been having a hard time eating (lots of vomiting) and although I feel hungry I can only seem to eat ittle amounts at a time. I have been making sure that I get some healthy food every day (mostly fruits and veggies), even though it is not a huge amount.
Just wondering if any of you have experienced the same thing. When did you ladies start showing?

Two Heart Beats!!!!

I am so overwhelmed because yesterday was literally the best day of my life. I went for my ultrasound and I was so scared I couldn't talk or focus on anything. It felt like an enternity before we got in to see the ultrasound tech and I had to remind myself to breath. I tried to "relax" during the external ultra sound and to fill myself with positive thoughts. That lasted about 2 minutes before I started to panic. It felt like the tech wasn't able to find my embabies so I freaked out a bit. I told her how nervous I was and she could sense my panic. She told me that my bladder wasn't as full as she would have liked so it was just a bit harder to see. I explained that I had a bladder infection and filling it was kind of painful and hard to do. She was very understanding and told me she would tell me as soon as she saw anything. Thankfully, within seconds she found one and then another heartbeat. It was such a relief and I just started bawling uncontrollably. She was super sweet and even held my shaking legs. Then I snuck out to get hubby for the internal ultrasound and we got to see the heartbeats together. It was an incredible moment and even hubby had tears in his eyes. Baby A's heartbeat was 146 and Baby B's was 157. I have refrained from goggling heartbeats and choose to believe when the nurse told me that everything was perfect.
I can finally breath and I can't believe this is actually happening. It has been such a long road and it feels like my dreams of having a family might actually come true. I can't help but think that I wouldn't be here without my sister. I don't know how I got so lucky to have such an amazing sister but I am truly grateful!!