hello doctor my period as per my cycle its on 23rd feb 2022.last I got period on 12th jan..its almost 50th day for me..we are trying for pragancy.my period cycle almost 40 to 45 days.last Month I did all the test suggested by gyno, all reports normal only.this month period time on 20 to 23rd ,but since 15th feb I have light bleeding,(almost 15 days) only after urin when I wipe i can see in tissue only.. but no flow.2 days back i did urin pragancy test.. its came negative. pls suggest what is the reason its happening .any possiblity of positive pragancy in this sicuvation.