This is either
Awakened by Her Ultra-rich Enemy - by Marcella Bell
.a.k.a Secretly Pregnant by the Tycoon -- by Bella Mason
or
Reclaimed by his Billion-Dollar Ring - by Julie James

♡ Awakened by Her Ultra-rich Enemy - by Marcella Bell
a.k.a. Secretly Pregnant by the Tycoon - by Bella Mason
One week of pure pleasure… Forever bound by the consequences! Famed for his ruthless restraint, Matt Taylor has only ever lost control around one woman. But his red-hot Melbourne fling with Hannah Murphy is firmly in the past—until she surprises him outside his London office…seven months pregnant! Hannah has flown across the globe to reveal her recently discovered pregnancy. But Matt’s guarded reaction leaves her wondering how he’s the same man who fulfilled her greatest desires months before! He’ll have to let her in if she’s to uproot her world and share everything—including their baby—with him…

Reclaimed by his Billion-Dollar Ring -- Julia James,
the Greek billionaire returns with a surprise proposition… Her heart won’t forgive him.Her body can’t forget him. It’s been eight years since Nikos Kavadis left Calanthe Petranakos without a goodbye, but the sting feels fresh when she sees him across a crowded Athens ballroom. He once introduced her to passion—then he shattered her trust. It’s horribly clear Calanthe is still susceptible to Nikos’s potent brand of masculinity. But even so, the Greek’s shocking proposal leaves her breathless. Because whilst agreeing to be his bride is the only way to help her ailing father, it feels like she’s walking back into the lion’s den