Hi welcome to the health care magic If seminal fluid doesn t enter into vagina than pregnancy is very unlikely.... If you have done intercourse than rule out pregnancy by urine card test Your work up needed as follow... -pelvic examination -per speculum examination to see white curd like discharge in case of candida fungal infection -pelvic USG... According to cause further specific treatment given Obesity, excess stress, prolonged fasting, Hormonal imbalance, ovarian problem, diabetes and thyroid disorder can lead delayed period that should be ruled out Consult gynecologist for examination