What dietary supplement do you recommend?

I've been working out for a couple months and have only lost a couple pounds. I'm trying to get a little healthier because my partner and I are trying to conceive. Do you recommend any pills or patches? Something I can buy at Wal-Mart would be nice. First and foremost it needs to be safe to use while TTC, but I also need something that will be easy on my heart. My mom and I have heart murmurs and a few years ago she took Hydroxycut and she had a lot of problems with her heart beating a little too fast. What should I try?