Last May 29, My Boyfriend And I Had An Unprotected

Last May 29, my boyfriend and I had an unprotected deed (no penetration, just rub his thing on me) Last June 01, i took ESP(Nordette Pills) and experienced nausea, vomiting and mood swings. And just now, i had my menstruation (day before my expected period) but it's not like my normal period. The flow is fewer than my regular menstruation, i wanna know if this could be implantation bleeding or side effects of ESP and if it is my real MENSTRUATION? And could i still have this chance of being pregnant

Thank you!