help! no af & BFN


I'm 24 years old and my husband and I have only been ttc for 2 months my last period started Feb1 I am now 22dpo and on CD 48 but keep getting bfn! I saw the Dr last week and was told to come in next week if af still hadn't arrived! I've been nauseous a little crampy and cant sleep! has anyone had this and gotten a bfp after this long!?!