I missed my second depo shot a week or twother ago and I had unprotected sex a couple times that week. I started my period but it's a lot different than normal. I'm nauseous all the time, I get nauseous from certain smells. I've been really dizzy and tired lately. Also my period haso been a lot lighter than normal. I've been cramping but it's a different kind of cramp. My period has lasted barely over a week.