Old romance viking book cant remember title or nothing
Thanks for your question! I did some searching in Novelist, and I think I've got a couple possibilities to run by you. Unfortunately, the books that look like they might be a good match are no longer in our collection (romance novels always seem to wear out fast) so it's tough to say for sure.
Margaret Moore, The Viking, 1993. Plot points about the kidnapping raid and women fighting to defend their village and children. The reasons for the raid don't quite line up, though.
Penelope Neri, Enchanted, 1993. The heroine in this one is an herbalist and physician; it's got the plot point about nursing the injured Viking back to health, and she might have the right skills to investigate the Viking women's infertility.
Diana Groe, Erinsong, 2006. It's a little late to the party, but it's got that 'tending a wounded Viking' angle.
Sandra Hill is a big player in the world of Viking-themed romance; scrolled through several dozen synopses and didn't see any that felt quite right, but the cover art, etc. might ring a bell for you. A lot of her stories have a distinctive time-travel element (Vikings and Navy SEALs are interchangeable, who knew?) that probably would have stood out, but of the four authors here she's probably best known for turning up the steam.
A search inside Novelist for "Viking romance" will turn up a good chunk of results - you might take a look and see if anything looks familiar! But if none of these seemed quite right, let us know and we can keep searching. Thanks again for your question.