help!!

so i had sex when i was ovulating, and since then i am 12 days late i took 2 digital pregnancy tests last weekend bfns my boobs are so tender i’m starving every second and i normally have a flat stomach which has converted to a kangaroo pouch ...even with the negatives should i retest ? when my mom was pregnant with me she didn’t find out til 5 months an 6 days all her urine tests came out negative even her blood tests!!