Discomfort and pressure in my stomach during pregnancy? (someone please help.)?

Last time I mentioned this on Y!A I was told to go to the hospital which I think is stupid. I'm having mild cramps through out the day (every day) slight occasional pain a few times a week (nothing severe or long lasting) and no bleeding. But my lower abdomen feels... heavy almost, there's a lot of weird pressure and its very uncomfortable. This is my first pregnancy and I am just about 12 weeks along. I'm confused as to what's going on, my friends who've been pregnant usually haven't experienced this when they were in their early stages of pregnancy, also I'm not gaining too much weight but I'm showing a lot more than I should be, I look about 20+ weeks along, my baby book says constipation makes bowels swell and makes your stomach bigger...? Quick fyi I've had an ultra sound and everything is great they could see the heart beat and my hcg leves are super high, id just like someone to make sense of all the pressure and discomfort.