Please help!

So my husband and I have been TTC baby #2 for a little over a week. I know that’s not long but the past few days I’ve been getting nauseous if I don’t eat and that usually doesn’t happen. It happened with my first baby. I have been extremely hot all day long Like sweating and I’m a SAHM so i stay inside all day. A few days after we started trying I had vaginal cramps but they didn’t last long. My periods are VERY irregular and I’m on cycle day 43. I took a test 2 days ago which was negative. Today I’m extremely hot a little nauseous, my stomach feels funny and I’ve been easily short of breath. It feels tight in a way. What do y’all think?