Nauseas

I'm supposed to start my period on Sunday, yesterday I felt super tired and slept nearly all afternoon and today I've felt very nauseated. I tried burping a couple of times and felt like vomit was going to come out. I still feel this way and I ate lunch at 11 am. I've been trying for baby#1 for 6 months and I've started breaking out near my chin area and light cramps to my right side today. Anyone else feel this way..:I don't want to get my hopes up b/c I've had all negative tests for past 6 months. This past month i finally tried preseed but only for like 3 days...also what does it mean when someone tells you that your uterus is low( I had a assuage for my back and some lady told me that)