I was offered the progesterone suppositories after 7 miscarriages, I was told to start them as and when I was trying to conceive not once I was pregnant I'm presuming the progesterone needs to be your system for the egg to implant and grow etc. I was on them for 3 months before I fell on then increased the dosage which lead to a healthy pregnancy and baby at the end which I never thought would happen. Are you taking the suppositories or injection?
I just started progesterone suppositories this cycle 3DPO (late ovulation, miscarriages and short luteal phase) and am currently 10DPO. Lots of symptoms as Amy described but my doctor said to wait until 18 DPO and to continue testing for pregnancy prior to stopping using them.
I was under a private fertility clinic and they say to do it 3 days after ovulation anyway. Iv done it with all my cycles. They give quite cruel side effects though so what I will say is don't read to much into them as possible pregnancy symptoms. For example gassy , sore boobs/ nipples, bloating , making you wee 100 times a day etc. X