If you truly love someone, there is no need to check if she is fertile or not. You can adopt a child if she is having fertility problems. And modern technology has made it more easier for people to have children through diverse means.
Technology has advanced significantly but that doesn't mean it can solve everything, especially rare diseases and infertility. Infertility treatment is difficult, time consuming and extremely expensive, not every couple can afford to pay those huge bills.
In my opinion, with the increasing rate of infertility and birth defects, it is necessary to check the fertility of the partner before marriage. But this must be done voluntarily by both parties, not under coercion or command. Because like you said, that's not love.
In addition, couples should encourage each other to get medical check-ups as soon as possible because some diseases can be cured if detected early.