I am on the Nuva Ring. The first day of my last period was May 19. I put my Nuva Ring in May 23. My partner and i had sex the day i put the Nuva Ring in with no protection and he came inside me. Since then i have been moody, urinating frequently, had backaches, headaches, and dizziness. My period was suppose to come on June 13 but it didn't. Today i started what i think might be my period, but it is much much lighter than my normal period. Could i be pregnant?