Sperm count has nothing to to with twin pregnancy. Twin pregnancy depends upon fertilization of two eggs which is rare and division of the zygote in to 2 or 3 pieces accidentally. Normal sperm count needs more details like percentage of normal sperms, motile sperms and fast moving sperms etc. A sperm count of 34 millions does not tell complete detail of normal sperm count.
You don't need to check with a fertility dr. Like the first answer said, twins occur when the WOMANS body produces two eggs or an egg splits. Even if it splits it is after one sperm fertilizes the egg. Only one sperm can fertilize one egg. I also am not sure... But I don't recall 34 mill vein exceptionally high. That is a question you can ask a dr. Along with some of the things mentioned in the 1st reply
You could check with an infertility expert.