SOLVED. Adult SciFi Space fiction - Starts on planet that is not Earth, male protagonist, sent as undercover agent with female agent to Earth. Read before 2011.

[Christopher]

The main protagonist is on a planet that is not earth, gravity is higher than earth's. He goes into the military, ends up becoming an undercover agent. Eventually he and a female partner are sent to earth undercover. The two are posing as a couple. Either he or the female operative's dermal implant to prevent pregnancy expires and female operative becomes pregnant. Earth is pretty much covered in industrial buildings if I remember correctly. I think I read the book before 2011.

[Jade]

Hi Christopher, are the main characters humans?

[Christopher]

Yes, they are both human. I don't remember if there are non human sapients in the book.

[Christopher]

I finally found it! It is The Weapon by Michael Z Williamson (freehold book 2)

[Alan]

The Weapon by Michael Z. Williamson, for the record.

[Kris]

Great! Glad you found your book, Christopher. Thanks for the update.