I had the implant put in Jan 12 and every month since I've has 2 periods each month, the same time each month until this month. I didn't have my 2nd period last month and haven't had my 1st this month and wondered if I could be prey? I've thought it before bt every time I get my period bt worried now it hasn't come. My boobs feel firmer and my nipples hurt when even my top touches thm, been feeling sick a lot too bt I've never suffered much morning sickness with my 2 kids. Took a test 2 days ago bt was negative. Any help?