Pregnant?

So my husband and I had sex the day before ovulation (according to glow). I have been light headed, dizzy and kinda faint feeling. I have lost my appetite, when I try to eat I get two to three bites in and can't make myself eat anymore (not nauseous though). Friday at work I coetely forgot to take my lunch break all together (normally I'm starving and want to eat every 3 hrs). I've had sharp poking feelings in my lower right abdomen for a couple of days and now it feels fine. I was constipated and my lower stomach was very hard and I am very bloated and slightly irritable and lower back pain (mild). My sex drive is definitely there but absolutely zero breast tenderness. My period is due in 4 days from today and I'm usually spot on. I took a test yesterday and it showed up negative. Could I be pregnant or is all this probably period related?