Two periods in a month or cycle length less than 22 days is called polymenorrhea. This is due to short secretory phase. This short secretory phase can be due progesterone deficiency. This progesterone deficiency can be due to corpus luteum insufficiency. There are no authentic symptoms of pregnancy. Only missing of periods on due dates suspect pregnancy.
Yes you can b ive been reading up on it because I'm going thru the same thing you can b pregnant its something called implantation bleeding so ive been told also if you don't cum on your period the followin month there is a chance you could b