Illegal? Not Being Paid For Automatically Deducted Breaks That Were Never Taken

I work at a large corporation in Idaho. While pregnant I was told I had to hit a minimum amount of hours to qualify for FMLA, so in my third trimester I upped my hours and worked my ass off to hit the goal so I could keep my insurance for the birth (it’s a very physical job so this sucked immensely). During this time I discovered that my employer has been automatically deducting 30 mins for every single shift I have worked the past two years. I have never once clocked out for a lunch, even while pregnant and needing to get off my feet. These time deductions added up to a significant amount of money and even more upsetting, time that could have allowed me to hit my FMLA goal and rest during my difficult pregnancy. I went into preterm labor at 35 weeks and luckily had just enough hours to keep my insurance (thank God). Do I have grounds to demand my back pay for the time I worked and didn’t take breaks? I know Idaho isn’t the best at protecting workers, but I feel like I deserve what I worked for. Some context, I asked my manager for hours to be refunded and they did “give” me back 10 hours. This was framed as a favor as this apparently “isn’t allowed” and a previous manager of this department had gotten in trouble with the CEO for refunding untaken lunch breaks before.