Pregnancy fear. Cause of ovral l?

Last sex 9th feb Period from 2nd feb to 6th feb I was on ovral l from 3rdFeb to 23rd feb Then had a bleeding from 27th feb to 4th march Next ovral l pack from 3rd march to 23rd march Bleeding from 28th march to 31dt march Next ovral l pack from 29th march to 18th april Bleeding from 23rd April to 27th april Had hcg beta test on 1st 8th 15th 22nd 29th march and 11th april and 23rd april All values less than 2 iu/l Aa in negative Also took home pregnancy tests which were negative And usg which also showed empty uterine cavity on 29th march and again on 13th april I am definitely not pregnancy right? 100 percent sure? Have had very regular periods in feb march april Last sex 9th feb Periods were lighter in feb and march Little heavier in april but lighter than my normal.periods without pills Is the bleeding lighter cause of ovral l?