The only suggestion I have is to try more lubrication. If you're ttc, then Preseed is a sperm-friendly lubricant. Since you're ttc, I am guessing you're not using condoms. That was the other thing that came to my mind - you're allergic to the condom latex.
Sorry I can't help more.
Some woman can be allergic to sperm.. Ive had a problem in the past but I would agree w/the above poster make sure you use enough lube.. Or if its the condoms try a non latex.
Could be a urinary tract infection, just a thought though. Is it when you urinate or all the time. Try using a condom to see if you might be allergic to his sperm, or if you use some sort of lube, you might check to make sure it's hypoallergenic.
It could even be an allergic reaction to a new soap or something like that. Good luck. I hope you get it figured out.
God Bless.
~Amanda
YOU COULD HAVE AN INFECTION OF SOME SORT. IF IT BOTHERS YOU THAT MUCH I WOULD GO TO YOUR DOCTOR AND SEE WHAT HE/SHE CAN'T DO FOR YOU. IT IS BETTER THAN YOU HURTING WHEN YOU SHOULDN'T BE, ESPECIALLY DURING SEX.
I agree, try lubricant, urinate before and after sex to help eliminate the risk of urinary tract infections, and as others mentioned, consult your doctor if the lubricant doesn't help.
Andi