It is possible that you are pregnant, but it sounds to me like you are about to start your period. If you think you are pregnant, you should take a home test or go see a doctor.
Yes, you very well can be but you won't really know until you take a test. I suggest you wait a week to take the test and if it's negative but you still suspect it than take another one in a week because the true answer usually shows up after a week or two. I had those crampy feelings and I was late and I did get pregnant, but I ended up miscarrying a month later.
Yes, you can definitely have cramping during pregnancy and does not necessarily mean a miscarriage. If you have any bleeding along with the cramping you should definitely bring it to you physician's attention. I would definitely be running up to Walmart and buying a pregnancy test if your period is past due.....
This is common and very common among women who have done Invetro-fertilization (IVF). It could even be implantation you are feeling. Take a test or wait a few more days then test if your period still has not shown up.
Yes, you can be pregnant but if you are on birth control that could be another factor. I have been taking the same birth control pill brand for about 6 months now and my periods are still not regulated.