8 days late!

I am 8 days late on my period. Took a test this morning and it was negative. Last week at the doctor I also took a urine test that was negative. No symptoms of pregnancy besides weight gain and fatigue but I'm not sure if it's just my usual tiredness or not. I have been dieting with no success and only gaining more weight. Went off of birth control in January and February my period came a couple days late so it may just be irregular since I've just gotten off of BC. I'm not sure. But everyone around me is preganant. I know we haven't been trying long but I'm still worrying.