Feeling off

Today I started to feel not like my self... I was trying to clean my house and I was getting shortness of breath/dizzy. I sat down for a bit and got so tired and I told my self I was going to just rest my eyes but ended up falling asleep. When I woke up I started getting hot flashes (I'm only 21) and now I feel like I have this lump in my throat (best way I can explain it) I am married and we are TTC. Could this possibly be early signs of pregnancy? Or should I be worried about something else. Period is about 4-5 days out.