well in my case i had really sore & tender breats and some cramping before i found out i was pregnant & also ii threw up a lot. thats when i knew something was up. but every women get different symptoms earlier or later then others.
If you're pregnant, all you can do is wait at least 2 weeks after intercourse of when your period is due and take a pregnancy test with first morning urine. If you are pregnant then go see your doctor right away and speak to them about it. I'm not 100% sure of the risks (if any) of being pregnant so soon after a kidney transplant.