This happened to me with 2 girls. The first time I was scared ****-less but without much hesitation she went and got herself the pill.
The second time was more tricky. It was with my gf, she didn't really want to, and it took me a bit of time to convince her, eventually she agreed as long as I pick it up for her. But unfortunately they don't allow you as a guy to pick it up. They not only not give it to you, they also treat you like a social menace!
It could be very possible that your soon-to-be mother feels too shy to pick up the pill
but really, to avoid pregnancy, go get it!
Yes, it can be painful to take it. And it might be embarrassing to deal with pharmacy staff, but the only way to reduce the chances to a ground-low is for her to take the pill.