I’m freaking out!!!

I’m 8 days late for my period and I haven’t been feeling well. Last year I missed my period for a whole month but the following month it finally came but this time I’ve had Intense cramps, fatigue, change in appetite, mood swings, tender breast. I just thought it was pms. I’ve been so uncomfortable I called my doctors office to try to make an appointment but I was told I had to take two pregnancy test 3-4 days apart then Call back. Well this is the first one and it popped up in less than 3 minutes!!! Is this accurate or should I buy a different test and take it. I feel like this is too good to be true!!