So sick of BFN's !

Kaitlyn • TTC OUR FIRST MIRACLE
Me and my hubby have been ttc for 8 months and no luck. Everytime i think i may be preg i test and then get AF the next day..im now 2 days late and have major cramping top middle of my stomach but so afraid to test and see a a BFN! My AF has always been u days long and since jan it has only been 5 days each month.How long should i wait before i really should test?