It could be contractions or it could be false contractions (Braxton Hicks)
Braxton Hicks
I think you may be referring to what are called "Braxton-Hicks" contractions.
only in the last trimester when they prepare the uterus for labor and are called Braxton Hicks contractions.
Braxton Hicks contractions come from a Doctor named John Braxton Hicks. He was the first doctor to ever describe what these type of contractions were. This was back in the mid-late 1800s.
You do not have noticeable Braxton Hicks contractions until you are in your 2nd and 3rd trimesters. But no you probably aren't pregnant. You cant tell 2 weeks before your missed period that you are pregnant without the help of a pregnancy test.
There's something called Braxton Hicks and you can read more about it in the link below.
False Labor
I am pregnant with my 4th child (29 weeks) and this is the only place I felt them, especially the Braxton/Hicks contractions.
Cats do not experience Braxton Hicks contractions in the same way that humans do. However, they can have practice contractions as they approach their due date, which may be similar but are typically less noticeable. These contractions help prepare the body for actual labor. If you observe any unusual behavior or signs in a pregnant cat, it's best to consult a veterinarian.
Sounds like Braxton Hicks contractions. Not to worry, they are "practice" contractions. If they get painful, call the doc right away.
Yes, it is possible for constipation to cause contractions. Many pregnant women experience more Braxton Hicks contractions, which are uncomfortable but safe, when they are either constipated or suffering from large amounts of gas.