Have regular period except for last three months where they have dropped to 1 days from 5.. nausea and feel movement in stomach.. could i be pregnant?

Take a test: Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection. After this much time clearly you are not pregnant. See your doctor for irregular periods.

Yes: There can be bleeding in early pregnancy. If your period changes significantly and you could be pregnant, it makes sense to do a pregnancy test.