Should I test???

Me and my s/o had unprotected sex the 20th of May!! which was a fertile day and he also came in me. No spotting at all after like 2 weeks but I was having mood swings getting sad and angry for no reason and also breast tenderness so I thought it was PMS so the day before my expected period I was having cramps and constipation no bleeding but my periods are usually a day late so I didn’t think anything of it. I am now 3 days late I have a headache my back hurts I’ve been nauseous and hungry all day sore throat and I’m super tired. What should I do. (SORRY I MESSED UP THE DATE!!)