Monster energy??

I an 23 and my husband and I are trying to conceive . this Is the first month we have been using glow but we've been trying for 4 months. I drink a half of a monster energy every morning . can this cause issues getting pregnant? I can't drink a whole one because the caffeine is to much. But I need just a little boost. I know they're not good for me but I just want to find out if this little but if causing my difficultly getting pregnant. And if I were to get pregnant and didn't know early enough and had one.. Could it cause a miscarriage?? Thank you!!