Can Celery juice be harmful in early pregnancy?

I have been trying to conceive. I had a faint line in my home pregnancy test today (might be positive) This evening I added one celery s. on my juicer along with other fruits and drank about two cups of the juice. today is my 8 day past ovulation. I was reading about vitamins on veg and fruits and pregnancy and read that celery can stimulate menstruation. Does anyone heard about celery being harmful in early pregnancy, or cause abortion if consumed?