What should I do?

I've been trying to get pregnant for YEARS. Last month, my period started two days early, but I was so upset by the fact that I felt the period cramps, that I just shoved a tampon in and didn't check for a whole day to see if I was bleeding. I checked the second day, and saw a streak of blood on a pad. I didn't bleed much more, but I often have a light period. Because I started two days early, I decided to test a week after my period ended, and I strangely saw a second line on a frer. Very, very faint though. So I tested a few more days, and I got positive, negative, positive, negative. So I was like:wtf? Anyways, I waited a few more days, and tested again tonight, and the line is DARKER!! I am in cd12 of a "new" cycle. I've been on Letrozole for months, so who knows if it's screwing with my cycle. I literally have no idea what to do. I don't want to mention it to my husband. He will think I am cracking up. I would take a pic of the test, but my photo storage is full🙄.