Chemical Pregnancy

I needed to post to get my feelings out....I knew I was pregnant 4 days after we tried for baby....two pregnancy tests showed that I was right, one last weds and one on Friday. That pregnant feeling disappeared yesterday morning and pregnant test negative this morning and about an hour ago I’ve come on my period and have bad cramping, I’m devastated, I have been so excited and over the moon for the last couple of weeks and now my world has come crashing down. My husband doesn’t understand why I’m so upset as he never really believed I was pregnant but it’s my body telling me and I feel responsible for this happening to me! Anyone else going through same thing?