Iron supplement for anemia

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Hey yall, so im just wondering if anyone has had the same problem or something similar.

At 30 weeks I was told I was anemic and needed to start taking iron supplements, just one pill a day. I took it for about a week and started getting heart palpitations and figured maybe it was from over doing it (just doing too much)...well im forgetful and forget to take the supplements sometimes...im not 34w 5d && i havent taken the supplements for about a week now and last night took it && again had heart palpitations for about 4 hours til i went to sleep....

Does this happen to anyone else taking them??