I had the implanon (nexplanon) inserted on the 3rd day of my monthly cycle, my doctor told me to wait about 2 weeks before having unprotected sex. I had unprotected sex 12/13 days after having it inserted (day 15 of my cycle) should i be worried about pregnancy? I've read in most places it starts to work straight away if inserted between days 1-5? Im beginning to get myself worked up about it now, my period is due in 10 days but im not sure if my cycle is going to change because of the implanon.