Prenatal Pill, Vitamins...important question ???

Cortney • 30 years old, been married for 7 years....Have one rambunctious toddler! Trying for a 2nd one :)
Hello,
​I just found out today I am pregnant with my first child!! Probably happiest moment of my life. I couldn't get an appointment till I was 7 weeks along and I know that is completely normal. I am just wondering if I should be taking any vitamins or prental pills until then?? I went to the doctors last year and he gave me a prescription of prenatal pills and I looked at the bottle today and the expiration date is September 2014. I just want my little poppy seed to get his or her nutrients!! Responses will be appreciated you girls rock !!
​And yes I took 4 tests haha I just wanted to make sure I didn't get a false positive.