Aiyoh, that on-off bloating is so common in early pregnancy, especially around 6 weeks, hormones are just going crazy at that stage, and it can come and go like that for weeks. A few of us mums went through the same thing, and honestly one day we'd feel like we're carrying twins, next day flat as a pancake, so don't worry yourself too much! That said, if the bloating comes with pain, spotting, or anything that just doesn't feel right, better check with your doctor just to be safe and put your mind at ease.