Unlikely - the bleeding probably was your period
By taking a pregnancy test.
go to your doctor and get a blood pregnancy test
While some pregnancy test can tell you up to 5 days before your missed period, it's always best in my opinion to wait until your missed period. I would say a few days after your next hopefully missed period.
You may not be pregnant, you may not be far enough along to test, you may not have followed the test instructions.
You can be sure that you are not pregnant as all three tests were negative.
If your pregnant, cramping is usual. But if you're not and you missed your period that usually means your pregnant now with a bundle of joy.
When you go take a pregnancy test
It depends on what kind of pregnancy test you take. Some tests will label their tests as "Results 5 days before missed period" or somethin similar. This means that they are capable of detecting pregnancy four days before your missed period. But keep in mind that each day further away from your "expected period" the test will be less accurate. False negative pregnancy tests are much more common that false positive pregnancy tests. So if you get a negative result four days before your expected period, that may not always mean you are not pregnant.
You should wait until you have missed your period before you take a pregnancy test. If it is negative and you still have not gotten your period within a week, take another test.
you are coming into the menopause stage of your life so that may be the reason for the missed period and negative pregnancy test. the likely hood of being pregnant afer having your tubes tied is pretty much none existant
One line on a pregnancy test is negative but that doesn't mean you are definitely not pregnant as the test could of missed it or you might not be far enough along