This is most probably a hormonal problem, meet a gynaecologist

Are you taking any hormones like contraceptive pills or other hormones. You need to get examined by gynaecologist to check if there is any polyp on cervix or coming from inside uterus. Also os there any increased vascular it called erosion or ectopic which is causing spotting. Of all is negative then we may supplement you with hormones from outside for three months and imbalance corrected,