Am i pregnant

hi everyone .. last year october i fell pregant but in november i had i miscarriage just .. since then i tried getting pregnant but it didnt help.. and now its may my last period was april im now 8 days late.. i feel nauseas for 2 week now and some crampinh thinking its my period but still nothing.. i took a pregnacy test monday the first line showed the second one was almost unseen then yesterday i took a nother one and then it was invalid their where no lines at all so now im confused cause their is white tick discharge as well please help