I'd suspected my husband was having an affair with his secretary for months, but I bided my time. Then an unexpected doctor's visit turned the tables on them all.

For months, I'd had this nagging feeling deep in my gut that my husband, Ryan, was involved in an improper relationship with his secretary, Amber.

It was like a shadow that followed me everywhere, a constant reminder of the betrayal that was likely happening right under my nose. But instead of confronting him right away, I decided to keep quiet.

I knew that rushing in with guns blazing would only tip them off, and I wanted to be ready when the time was right.

One day at a prenatal check-up appointment, everything changed. It was a turning point that I had been waiting for, even if I didn't know it at the time.

I'd known about the affair long before Ryan started acting strange. It was the little things at first. He'd started coming home late, making up all sorts of excuses about overtime at work. And then there was his phone.

He was overly secretive with it, always keeping it face-down and jumping at the slightest notification. What he didn't know was that his betrayal would give me the perfect chance to fight back.

For ten years, Ryan thought my silence was a sign of weakness. He made fun of my job as a financial analyst. He'd say things like, "It's just number crunching, Lisa. Anyone can do that."

At social events, he introduced me as the one who takes care of the home, completely disregarding the fact that I'd used my financial skills to save his struggling advertising firm, Horizon Ads, three years ago.

What he also didn't know was that I still had control over the trust that owned 51% of the company. I'd been careful to keep that fact hidden, knowing that it could be my ace in the hole if things ever went south.

Amber was young and brash. Her lipstick stains were sometimes on his collar, a blatant sign of their affair. And there were those mysterious charges on a credit card he thought I never looked at.

I'd sit there, looking at the statements, and my blood would boil. Once at a restaurant, she sent him a text, and he quickly turned his phone away with a smirk. "Something interesting?" I asked, sipping my coffee calmly, trying to keep my composure.

"Work stuff," Ryan replied, barely glancing up. "You wouldn't get it." I understood all too well. So, I started collecting every piece of evidence I could find.

I gathered receipts from the fancy restaurants they'd been to, texts that he'd accidentally left open on his phone, and even some security camera footage from the building where his office was located. It was a painstaking process, but I was determined.

It was incredibly painful to wait. Every day, I had to pretend like nothing was wrong, like I didn't know what was going on behind my back. But showing my anger would have tipped them off. I let Ryan think I was just a naive wife.

Meanwhile, I was taking steps to protect myself. I separated our finances, making sure that my money was safe. I made copies of important company documents, just in case he tried to pull something. And I put our house under the protection of a prenuptial trust.

Every night, he slept beside me thinking I was in the dark, while I was building a case against him.

The opportunity came at Greenfield Women's Healthcare. I had gone there to pick up some old medical records from Dr. Emily Davis, a friend from high school who had treated Ryan when we were trying to have a baby.