Can iron supplements make you sick?

31 weeks today - After my GD test came back negative, my doctor said the only issue was that I am anemic and should start taking iron supplements every other day.

I started this week and felt unwell on Sunday, Tuesday, and am feeling really nauseous again today after taking it. At first, I thought it was my morning sickness coming back, but now after thinking about it, I only feel sick on the days I take the supplement.

It’s a relatively low, slow release dose. Could this be making me sick? Is there a better alternative? I don’t think I’ll make it through the third trimester if I am back to constant nausea/vomiting 😔