I saw a similar question on ivillage, this was the answer that they gave:

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there is absolutely no risk to sharing the same blood type. The pregnancy risk normally associated with blood type has to do not with the abo factor (the letter designation in blood type) but with the rh factor (the "positive" or "negative" designation). A woman who is rh negative may develop antibodies to her baby's blood if the father -- and thus the baby -- is rh positive. Untreated, these antibodies can attack the blood cells of the fetus. This is easily prevented with an injection of a substance called rhogam that blocks the formation of these antibodies in the mother. In rare cases, an intrauterine blood transfusion may be necessary. Blood testing and rhogam shots (when necessary) are a standard part of prenatal care.
We often recommend pre-pregnancy screening for rh and other, rarer abnormal blood antibodies that may affect a pregnancy. Testing the man is necessary only if the woman's test reveals abnormal antibodies. Luckily, the presence of antibodies that can cross the placenta and attack the baby are quite rare. If you do have such antibodies, or if you have had a prior pregnancy in which hemolytic disease (in which antibodies attack the fetus) occurred, then you and your husband may want to consider using donor sperm to avoid this risk to the fetus.
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so according to this article since you both have the " " designation, then there shouldn't be any problem

I'm .Rh negative and my fiance is .Rh positive so I had to get the shot. Only 15 percent of women are .Rh negative.

The post .Tigres made is 100% correct...There should be no problem with blood types and conceiving...

Sarah

I'm .Rh negative too, so is my mom. I dunno about my bf though, but I told him before we actually start ttc, I want him to find out.

My mom was .O - and my dad was .A so i'm .A- which is a rare blood type. I hope my child is .Rh - so I don't have to get another .Rhogam shot!!

Sarah

Hey!! I'm .A- too! It is super rare! My bf does not know his blood type either so they made me take the shot too at 28 weeks and after having trey. I also had one after my 2nd miscarriage. But 2 same is fine. Good luck ttc.

Wow...You're the first person i've ever met to have .A- blood!!! We're special!!! I hope my baby is a negative too...I hate needles!! Lol...

Sarah

i'm a - too :) found out after I gave blood. I thought I was o like my dad and my sister, but apparently I got a - just like my mom.

Yay vee!! We can transfuse each other!!!!! Lol

trey is ab so does that mean mikey (bf) is b or ab ?? His mom doesn't even know what he is.

I'm not good with blood types but either one is possible I think. Don't quote me though my brain's not quite working yet. It's still too early. :)

Lol jess well hey if u ever need blood u know who to call ;)

Mee tooo!! Lol...I never thought I come across another .A- person, let alone 3!!! Wow...I tried looking up the blood type a while back and got soo little, it wasn't even funny!! Lol...

I don't know what my .Fiance is but, more than likely, he's positive. His parents have no idea cuz he was born at .Charity .Hospital. Records aren't to great at that hospital. Of course now it's gone forever, but hey!! It's all good!


Sarah