AF is late

AF is now 2 days late. I am as regular as clockwork. I haven't had any signs of her showing up. I'm exhausted. Super emotional. Yesterday, DF asked me if I started. I told him no. He told me that he felt nauseous and Then threw up before work and he's convinced I'm pregnant because he gets morning sickness. I told him not to get his hopes up, and I'm not getting mine up. I don't know how much longer I should wait before I buy an hpt and test. I'd really like to know, but I don't want it to be a BFN either. Ugh.