Drinking red bull??!??!

Nichole • I am a mother to one girl and one boy:) me and my DH just bought our 1st home together in 2014 and we look forward to the future
Welp I've known I was pregnant for 8 weeks and in that time I've had 4 8oz red bulls because between the caffeine and B6 they would help with headaches really bad nausea. I know seceral ppl who drank then while pregnant on occasion and they didn't have probelms. They have the same amount of caffeine as a small cup of coffee so I figured no more then 3 a month during this 1st few months would be just fine BUT today I drank one and it has my heart racing. I'm gonna make sure I don't drink anything with caffeine in it the rest of the day or eat any more chocolate but WOW I have decided this will definitely be the last red bull I have this pregnancy!!!!! Anyone else drink red bulls or any drink with their pregnancy???? Have any troubles? I Want this baby desperately and I'm not willing to do anything to harm him/her so NO MORE RED BULL FOR ME