Ashley~ That's how much I took and I never had side effects. Here's a list of what I took... 3 Dong Quai, 1200 mg Vitex, Prenatal, B Complex, preseed. I didn't use OPK's I used a Fern test. I have a problem of Oing really late and having a very short LP and it really helped me.
My charts were really funky and my OB was shocked that I was actually pregnant. Here is my chart the month before I got pregnant...

This is my pregnant chart. As you can see I never really had a period. and didn't ovulate the month before. And even spotted early in my pregnancy.
Hope I've maybe helped you. Even if your not perfect it is still possible to get pregnant. GL to you!