Terrible thought! Advice anyone?

Kimberly • 26 years old. Have a 4 year old a 1 and half year old.
Hi ladies. I've just reached the second trimester and I had a really horrible thought. All of a sudden I don't want this baby and was wishing I wasn't pregnant! I was over the moon when I got my bfp and so excited at my first scan and now it's changed. I feel so horribly guilty for thinking it. Has anyone else had this? I'm hoping it was just hormones and I'll get over it. Any thoughts would be much appreciated.