advise please...

So we've been ttc for the last 4-5 months.. Iv started using ovulation tests.. the first 3 days were faint lines (ovulation test pictures below) and yesterday and today nothing? Having sex every other day.. what's chance being pregnant? Been feeling really tired and falling asleep on settee, had cramp like feeling in lower stomach, headaches and feeling nauseous, Even sick this morning.. I'm never sick.. couldn't even eat food last night or finish my food tonight... what's going on with me? My last period was a week late and was spotting for 2 days then 2 days of light bleeding( not enough for pad) then a day or 2 spotting again.. please help..