40 days late but negative pregnancy test..

The first day of my last period is June 10, I haven’t had a period since not even a little spotting. I’ve taken 4 home pregnancy test. 2 first response and 2 clear blue and they all said negative or not pregnant. The first response was a little confusing because I thought I saw a second line but my husband couldn’t see it. It’s not normal for me to have gone this long without a period I skip maybe a month or so every once in awhile but I’ve been late for 40 days now. Has this happened to anyone else? Were you actually pregnant or was it something else? Help. Please any advice.