period is over a month late.. on birth control (nexplanon) have been having light pink bleeding.. back aches, FREQUENTLY peeing like every 10 minutes.. 3 negative pregnancy tests.. idk if I should just chill or if I should be worried. I am 6 months into my second nexplanon and have been having unprotected sex with my boyfriend for 4 years. is there a possibility of still getting pregnant on nexplanon??