I had spotting on day 1 of my period then regular bleeding on day 2 then spotting on day 3 now i have constant cramps why is that?

Pregnant?: First, obtain a pregnancy test. If this is negative, then no real need to have this evaluated unless this is a repetitive or persistent problem or a positive pregnancy test is seen later. Every woman will experience an occasional abnormal cycle. Persistent irregularities could be associated with an abnormal thyroid or prolactin blood test. Good luck.