Thanks for your query.
Sincet his period was not normal in bleeding pattern, yes, any of the following possibilities could exist :
A pregnancy with an impending miscarriage
An ectopic pregnancy - that is, pregnancy outside the uterus.
Abnormal menstrual bleeding
due to stress, anxiety, weight fluctuations, thyroid disorder
or any ovarian or uterine pathology.
Please take a HPT to rule out pregnancy, and consult a gynecologist.