Low Iron Advice and Recommendations

I had some bloodwork done two days ago. My doctor called me this afternoon to go over the results. I assured her that I would work on my diabetes and cholesterol. Now I'm told I have low iron! She asked me if my period was heavy. I said yes. I had blood clots a year ago and had to get my IUD removed. I made a full recovery and am no longer on blood thinners since I parted ways with my IUD, but my period is uncontrollably heavy for the first two or three days. I was cleared for pregnancy and started ttc in September. I just started taking Garden of Life Mykind Organics Prenatal Multi Berry 120 Gummies, but now I have to add iron as well. I like my gummies because they are kosher and have no plans to switch to another brand of prenatals.

If you've been in this situation before, do you have any advice for me? What iron supplements did you add to your prenatal vitamins that don't have iron in them? I prefer kosher supplements, but am open to all advice and recommendations. Thank you!