I would not. ReBath typically charges around $3200 just for a bathtub liner, and up to $5000 for the wall tile to be lined as well. They are nice, but they make the area just a little bit smaller....
I presume you mean that he came into the water, not in your vagina. It is highly unlikely that any sperm got into your vagina, but not totally impossible, thus pregnancy is highly unlikely but not...