I am ttc, have low prog & just started taking 4% crinone (progesterone gel). ov. was late this cycle. should i keep using crinone (progesterone gel) all 14 days even if it delays my period?

Implantation: If you are trying to conceive and using Progesterone for support, you may not detect any pregnancy hormones until 10 - 14 days after ovulation. The Progesterone may cause the breast swelling and delay your cycle. I would continue this until you confirm that you are not pregnant. Still, follow your doctor's recommendations and do not stop any support until instructed by your doctor.