Someone help me please!!!!

Hi, I finished my period on Saturday 31st October ( 4 days ago) I took an ovulation test yesterday and it was two very bright clear lines which means high lh surge then I took another test today and there's only a faint second line appeared so now I'm not sure what's going on! Can't anyone give me help or advice? I don't want to miss my fertile week so any help would be appreciated.