It's definitely not the fetus. If you are also having a full feeling, or bloated feeling you may just be experiencing gas or constipation. Not everyone experiences "morning sickness" the same way. I never threw-up once, but my intestines were in knots and felt awful the first three months.
I don't think its a baby. I just think its my insides squishing. I think once I find out how far along I am it'll ease my mind and my body so maybe I'll stop feeling things that aren't there because it really *****.
Ya, you aren't squished yet hon. Baby is the size of what? A grape? I forget the fruit . . . LOL that book that matches up each week to a type of food. I called my first baby a bean for a really long time of that because the first time I looked it up, my baby was a bean. But your body is undergoing changes. You may be retaining some water, bloating a bit which is making you feel 'full' in the way you describe. You have a long way to go. Just know, your body will shift often as you go, changing what hurts, what's feeling different, etc. And you kind of just have to roll with it. good luck
At 6ish weeks nothing has really moved yet, your uterus hasn't started to expand. If you're having a squished feeling make sure to mention it to you OB or call your PCP and check in with them.