Shay Mitchell was "completely blindsided" by her miscarriage

Speaking in episode one of her YouTube series, she said: "I chose to hold on until I announced because of the first time. It didn't go as I had hoped for, and it was extremely difficult. The first time that I was pregnant last year, Matt and I hadn't been planning, it happened and we were really excited about it. I was like 14 weeks, at that point, I had no idea the percentage of miscarriages. When it happened I was just, completely blindsided by it. And it's weird because, I haven't looked at them, obviously. But, it's not like I forgot about that happening, so of course I'm like super happy, but I still feel for that one that I lost."

Shay announced last month that she is expecting her first child.

Announcing her news on Instagram, she wrote: "Does this mean I'm allowed to drive in the car pool lane at all times now? (sic)"

And Shay revealed it had been "hard" to keep her pregnancy a secret.

She said: "When you're in the public eye, there are some things you want to just keep a secret until you feel ready. This, for me, has been the hardest.

"It's going to be really fun and awesome when I'm not trying to hide it anymore. I didn't want to come out on social media so early on. I'm going to be so happy when this comes out. I can be pregnant, like not suck my stomach in."