I am 27 years old. 5'3. 50 kgs. Allergic to dust. Have been trying to get pregnant. Very regular periods. Every 29th day. Ideally I should get it today. Had sex on september 15th and 16th. am on medication for skin infection from yesterday . Chymoral Forte and Augpen 625. Have very very slight bleeding with all PMS signs. I generally have heavy bleeding on 1sy day. Please explain.