Help so confused!

Please help me so iv been ttc with my so for about 6months now n this month i had sex on all my fertile days n beyound about 6dpo i had cramping slightly iv been tired from nothing and eating more hot flashs alot peeing alot and aching boobs and 13dpo i took a test n BFN so i waited for af. Af is now 3 days late with no signs of comming i took a test this afternoon thought i saw a faint pos but after min it was clearly neg what do you think i should do? Im so confused could i b pregnant?