Nadine Dorries said she was "shocked" to discover the number of men and women on the Joint Committee on Vaccination and Immunisation (JCVI).
The minister suggested scientific committees taking decisions about women's health should have a gender balance.
Speaking during a Westminster Hall debate on reducing baby loss, Ms Dorries told Labour MP Sarah Owen: "She made the point that the Government needs to ensure that all pregnant women are vaccinated.
I am unsurprised at the JCVI not emphasising or prioritising pregnant women for vaccination
"My daughter is 32 weeks pregnant, so no-one has been more aware of that than me, but I am afraid that politicians do not make clinical decisions, and the Government is not the JCVI - the Joint Committee on Vaccination and Immunisation - it is completely independent. They decide who is vaccinated.
"But I would tell (Ms Owen) that I was quite shocked to discover - after constantly asking why pregnant women aren't being prioritised - I just took a glance at the make-up of the JCVI, to discover that it is made up of 14 men and three women.
"So I am unsurprised at the JCVI not emphasising or prioritising pregnant women for vaccination.
"Again, that is a point I am raising within the department and in particular with the women's health strategy - because maybe all scientific committees that make decisions about women's health should have a gender balance."
On the Government's JCVI webpage, it lists 16 members - of which 12 are men and four are women.
A further four women are listed as "co-opted members" for "implementation matters".
There is also a Covid-19 sub-committee, containing 13 men and six women.