I don't have any personal experience with fibroids or a retroverted uterus, but if your gynocologist says it won't interfere with TTC, then I would just trust her on that. As for the symptoms you're experiencing, the cramps could be a good sign. Many women do get period-type craps in early pregnancy (myself included). The discharge, on the other hand, is not necessarily an indication, and I've never heard of leg cramps being a pregnancy symptom before...but you never know, I guess.
And lastly, it is totally normal for the semen to come back out after intercourse. The viable sperm leaves the seminal fluid pretty quickly and enters your cervix, but the leftover fluids will often come back out whenever you get up. It's not a big deal, but if you want to maximize your chances, you could stay in bed for about 15 minutes after...just to make sure the sperm has a chance to enter the cervix.
Good luck with everything!
Oh, and I also wanted to give you a link to the Fertility Forum here on MedHelp, where there are lots of ladies currently TTC:
You should check it out!