I’m soooo confused

So I went to the hospital I explain to them that I have a 28-35 day period so Im days late so like 39 almost 40 I think over and I told them that I’ve gotten negative pregnancy at home with pee what they do lol they do a pee test anyways so here are my run down about what’s going with me I’m 7 days late for my period and never have been 7 days late ever and yess I took many pregnancy test They all came back BFN soo im just considering getting blood test now I basically missed the mouth of August period just to give y’all a run down my period in July and now btw I had my full blown period on the 1st of July and had bleeding again on the 28th of July which was little to none someone please help me ... should I just get blood test now ? But the doctor wouldn’t even listen to me they just said wait other week I’ve been deal with this for 8 weeks now being unsure if I’m pregnant are not and I could be 8weeks pregnant by the way 😩 so what should I do