Celexa during pregnancy? Is it safe??

Hi everyone!! First of all, I am not pregnant, that I know of for certain. I am actually not even late yet. I'm due for menstrual 2/05, however, my breasts are so swollen and achy, I have a really big feeling... Anyway, I take 40mg celexa at night, is this safe to take, I'd hate to stop taking it if I'm not, but I would never forgive myself if I am preg and something happens to the baby because I didn't stop.

Actually, I had a baby girl 1/07/2008, in July hubby had vasectomy, was told after 20 times to come in for a count. We made it to 15 times early January, then decided that was enough and no longer needed other protection (spermicide insert). We had unprotected 3 times right at ovulation time week, and I'm just very nervous/ anxious/concerned. The same thing happened with last surprise pregnancy, we had unprotected 1 time and I got pregnant. I knew 10 days before I was even late because of the way my breasts felt. I am not nursing, she weaned herself at 6-7 months. Can't see why my brteats are so swollen and heavy and nipples starting to darken if I am not. Anyway, I stopped taking the anti-inflammatory just incase, but the celexa helps me a lot. Should I stop taking it incase, or don't worry about it until I take a HPT on Feb 5th if needed?? Thank you so much for your help on this!!
Brandy