Why Having No Periods After Unprotected Intercourse And Having Primolut N? Pregnancy Test Negative

My MC date was expecting on 5of march. Now days I m getting my period on my 35 days. First time I don t have period after 35 days. I had sexual unprotected sexual intercourse twice. I did prega test on my 35 days. it is negative. but still I don t have period .I am taking PrimolutN from last two days. But I am not getting my period. I don t understand what to do ? plz guide me