Help please

How is this possible? I thought I got a positive ovulation test on 18th August, now this is my 2nd one I've done today but I did a pregnancy test too and there is a faint line on it, how can this be? If I did ovulate then I would be around 5dpo I'm also feeling very nauseous for the past 3 days and today I've got like a tummy ache low down...

This one is after it has settled