The group wants to highlight the right women have to choose, but also demonstrate how parenthood rights and abortion rights are tied together.
It's a hot topic at present, as recent statistics revealed over half of women who have abortions are already mothers.
The collage of photos have been published on a new Tumblr account 'Pregnant, Parenting, and Pro-Choice', and features a selection of photos with mothers and their families.
Jodi Jacobson, RH Reality Check editor-in-chief, told Yahoo Parenting: "We are pro-choice and pregnant, pro-choice and parents, pro-choice and grandparents, aunts, uncles, adoptive, step-, and foster parents."
Jacobson said that presenting supporters of pro-choice on the Tumblr account has huge benefits.
On the Tumblr account, it states: "People from all walks of life support the right to determine the shape of their own futures. And here we are: some of us pregnant, some of us parenting, all of us pro-choice."
She told Yahoo Parenting: "With this tumblr we give statistics a face and offer people an ability to communicate their own support as mothers, adoptive parents, and fathers. It also shows that people have a right to make their own decisions about reproductive health.
"It gives people a way to make themselves visible as part of the pro-choice majority."
The photos feature mothers with their newborn babies, as well as families with grown-up children to show the diversity of supporters and their status as a family.
Sarah Tarver-Wahlquist wrote that her passion for reproductive and abortion rights has grown hand-in-hand with her passion for birthing rights.
She added: "By ignoring a woman’s basic right to make choices about her body and reproductive choices in choosing and obtaining and abortion, we start down the road of valuing the fetus over the woman."
One mother who posted a picture with her newborn baby wrote about the traumatising birth she had with her third daughter.
She said: "I’m glad we are done with our family now. I’m glad we could make the choice and all of our kids were wanted in the first place."
Diane Horvath-Cosper agreed that being mother didn't affect her decision to be pro-choice: "If anything, the incredible responsibility of caring for my amazing daughter has made me realise that parenting should be something that is entered into willingly and (ideally) joyfully.
"I will continue to provide abortions for my patients because a world of wanted children is the kind of world I want my daughter to grow up in."
Megan Amundson uploaded a photo with her daughter while she was holding the sign "A mother by choice, for choice".
She wrote on her post that no one should ever have to go through pregnancy if it's not the choice they wanted to make.
"Our daughter is healthy and beautiful and the best thing that ever happened to me. And having her made me even more pro-choice than I was before.”
Jacobson said becoming more articulate and visible about the rights of individuals to determine their own lives could help break down the stigma and barriers to abortion.