I started what i thought was my period last monday and by the next day it had stopped i had sex that thurs. and started bleeding but it stopped after ?

Irregular periods?: You should take a pregnancy test whenever you are sexually active and notice a significant change in your monthly periods. If they continue to be irregular, call your gynecologist.

Pregnancy test: If you have had an abnormal menses you should consider a pregnancy test. If these symptoms continue you should contact your md. S blood pregnancy test, thyroid function and other tests may be performed.