Anyone experienced unplanned second pregnancy? My baby is 3 mths old and I am pregnant again.?

I am having trouble coming to terms with it as I am not emotionally or physically ready for another pregnancy. I thought I was well past the fertile time of the mth, apparently not. I am married and my husband is very supportive though he too would not have wanted another child so quickly. Am feeling very down about it but know i should be happy as I am lucky to find it easy to get pregnant, etc. I have not been able to tell my family or friends yet.