Should i take a pregnancy test?!?!

My husband and i have been separated for almost a year. We decided to try and talk things through late last week. Well talking lead to A LOT of other things. Well since then ive been kind of cramping and feeling a little nauseous but not throwing up and a little light headed. I start my cycle in another 2 weeks. Should i just take a pregnancy test now? Or just wait because its only been like 4-5 days now?