I am 33 yrs old, have a 6 yrs old kid. In my last ovulation period, we tried to get pregnant again. I missed my next periods, after which I tested for pregnancy with Apollo kit, it came out negative. I tried after 3 4 days, still negative. Still my periods haven't started after more than a week. Is it normal, I usually don't track my periods, but they come every month for sure.

What could be the reason? Should I test again or check with the doc?

Also is Apollo kit dependable, last pregnancy I had used prega and got correct results just after missed period in first time