TTC # 2

Me and my husband have been try to get pregnant with our second child. It's been 4 years of nothing. Our first child took 4 years to conceive too. I have irregular periods and have been taking Fertility Blend for two months. I'm 5 days late on my period. I have been having regular cycles for the past 3 months. Should I test? Or wait it out? I'm so impatient!