18dpo 3days late

Im 18 dpo and 3 days late today. The last few days I've had cold like symptoms but no fever, just all the horrible body aches that come with one. I feel congested and my throat is slightly irritated from drainage. I'd blow my nose more to help that but literally nothing comes out.

Every test I have taken has been negative, nothing but a single line no matter how hard I look. I've had a few mild pelvic cramps which make me feel AF will arrive but I'm hoping I just miscalculated this cycle.