Confused! I don't know if I am pregnant!

Last month I had my period from the 9th to the 13th and I was supposed to get it again this month on the 6th according to Glow. I haven't gotten my period yet. I keep telling Glow that my period is late and it just delays it to 2 days after and nothing. I don't know what to think because last week I took 2 pregnancy tests ( dollar store) and they were negative. Last Saturday I decided to go buy an expensive one and got Clear Blue and negative again! My cycle chart says that I am on my day 35 and this has never happened to me. Have this happened to you ladies? I don't wanna take another test and get another Negative response. I'm healthy and i don't have hormones problems or nothing. Please comment. Thank in advance 😙