Really thought it was my month

Would have been due 12 days ago and feeling really down.

Had first steady smiley face on my ovulation test first positive one I've had. Keep seeing rainbows

Dogs been off with me and cat keeps sitting in my lap curling into my stomach last few days last time they did that I was pregnant ive had a heightened sense of smell so convinced it was my month but no af showed up an hour after I did a test which was negative. How angry am I feel like my body constantly letting me down. 2 miscarriages this year and now I can't even get pregnant again. Only good thing is I've lost 6 stone to hopefully be a better healthy weight to concive well it's not working so far what's the point I'm really beginning to wonder.