I have been on the nexplanon bc for a little over a year. About 7 months ago I went from having no period to having a few. The past 3 months I get my period for a week. Then off a week. Then on. We always use a condom but had anal sex 6 days ago without a condom and I haven't had my period in 2 weeks. But I have had some cramping. Could I be pregnant?