HELP PLZ...Fertilaid with regular cycles?

I have always been like clock work with AF and ovulating. 28-29 day cycle, O symptoms CD 11-12. I started taking Fertilaid and FertileCM near the beginning of last cycle. I've noticed a couple things unusual: no Ovulation symptoms that cycle and spotting 3 days before AF. AF did come as usual, CD 28. This cycle I haven't been taking it as religiously. It's CD 10 today, and I've had a negative opk. Hoping to confirm O this month with opk, but its still early. If i do not ovulate, or ovulate late, I may stop taking them. I plan to only take Fertilaid through ovulation and then switch to a prenatal due to the ingredient Vitex. Has anyone with regular cycles taken Fertilaid and/or FertileCM and had cycle or ovulation issues?