You are suffering from irregular spotting or bleeding for few days. There are several reasons like implantation
bleeding, local blunt injury
during sex, hormonal imbalance, mental stress/ tension, thyroid disturbance, uterine pathology (like polyp), cervical reason etc. These may hamper regular ovulation time and leads to conceiving problem.
Need to investigate properly to rule out underlying pathology by pelvic ultrasound, hormonal assay, endometrial biopsy
etc. So consult with your gynecologist and take suggestive measures.
Avoid stress, take healthy diet with Vit-E & Folic acid
supplements, control body wt and proper sleep. In addition, you should monitor your ovulation time by using ovulation prediction
kit (LH kit) to maximise chance of pregnancy.