I don't know, but I would say ask your doctor what a safe time is to start trying again seeing as how your son is only 4 months. I had a c-section in November and my doc gave us the go ahead to try starting in April. So I think it depends on your doc as to what he'll decide is right for you. We actually got pregnant right away and are due at the end of the year now. For me...I have a 28 day cycle and a 14 day luteal(sp?) phase. So I count backwards on my calander from the day I'm expected to get my period and when I get to day 14 I go 5 days befor that and 4 days after and had sex every other day as recommended by my doctor. I had EWCM for about 5 days which was very thick so I knew those we my fertile days. Some women don't get very much and some only get it the day before , the day after or the time of O. You can chart your temps, cervical position, and CM monthly to get an idea of how your body works and when you O. Also while doing this you should use OPK's to confirm you answers to your charts. You can use fertilityfriend.com for an easy way to keep track of everything. Good luck to you and lots of babydust your way!