So my period is 6 days late, and my fiancé and I don't use condoms. I'm on an IUD, but I've always gotten my period every month since I've gotten it. It's been late by 1-2 days, but never a week. Over the past 1-2 weeks, I've been feeling extremely tired, and don't want to even get out of bed because I'm so tired. I've felt nauseous a couple times, but not multiple days in a row. My nipples are also really sensitive right now too! lol. I know that's really weird, but my sister told me that hers were sensitive when she was pregnant.