Wait could it be possible ??

I’m 8 days late, it was not confirmed by opks but I’m pretty intuned with my body and it seemed to have happened fairly close to the predicted time here on glow. I tested around 5 days late but it was negative. I have had small cramps that come in waves similar to nausea that have lasted a good week n a half. And my boobs are heavy and huge!! Have been for a good week n a half. Should I retest? I’m just so nervous too..