Late period🤔

So my period is 14 days late. I'm in Day 37 of my cycle and I tested for pregnancy 3times (after missed period) on day 10, 12, &13. All were negative. But they were taken with the ¢88 test from Walmart. Do you think I should buy a more expensive test? Or just go to the doctors? I'm 33 I guess I should know these things. But I'm totally lost. This will be the second I've been pregnant if I am. The 1st one was a Ectopic pregnancy.