Thanks for posting your query,
As your expected date of periods is near by, the bleeding could be menstrual blood which might have appeared few days early.
-As you are trying for pregnancy
, there is possibility of miscarriage
and the blood and tissue could be products of conception.
-If you had cervical erosion etc. along with vaginal infection
that can bleed sometimes.
So you observe today, if the bleeding continues as normal menstrual flow no need to worry.
If intermittent passage of blood clots
occur with associated pain abdomen, better to consult gynecologist once and get examined.
Right now, it is quite early to go for pregnancy test.
If your period does not start, you can wait for 4-5 days & then get your urine pregnancy test done.
Hope I have answered your query. I will be available to answer your follow up queries.