Period 4 days late 2 BFN

So, my period is officially 4 days late. I’ve had back aches, mood swings, and painful breasts but I seem to always have there after my period starts. My cervix is low and soft. But I’ve taken 2 First Response 6 days sooner pregnancy test and there isn’t even a hint of a line. So now it’s just the wait….

Thoughts? Anyone every been has a pregnancy test take forever to show up?

The last time this happened, it ended in a miscarriage 3 days after the line showed up after a week of a missed period, so that makes me a little nervous.