Extreme on and off cramps

Hey guys so I have been experiencing on an off extreme like uterus cramps as of right now I am about six weeks and I don’t know like it’s not always but it seems to be whenever I’m waking up from a deep sleep but I’m not sure and I don’t know what to do about it what do you guys suggest.

Like could there be something going on with the baby inside because they say that you should only be feeling mild to moderate cramps similar to your period cramps. When the uterus is stretching, but these are more intense than my period cramps would be and I made sure to take another pregnancy test just to make sure the lines are still dark and that I’m not having a miscarriage. But the lines are still very dark so I’m not having a miscarriage but I’m just worried because it’s really bad pains. But then it goes away after a little while