pre-seed has excellent results !!!
You need some type of lubrication. There wouldn't be any hard in trying the type of lube called Preseed since you are ttc!
You could also use ways of increasing cervical mucous as well such as anything with guaifenesin. Which would be Robitussin. (Just the plain kind). You should also drink a lot more water, try out some green tea and try out evening primrose oil.
All of those things will improve the amount of cervical mucous which will inhance your chances of pregnancy. It'll also help your body lubricate so that everything isn't as painful.
Hope this helps!