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Dear Customer
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Regarding your question

Can you get one more testicle ?

No , you can't get one more testicle due to ethical and medicolegal issues , but if you are concered about having a child , you still have the chances even if you have single testes

What do you need to do in your case ?

you need to visit a urologist to conduct a full physical exam and to take full history form you,
he may do some palpation over the inguinal area to search for the missed testicle ,
but if there is no testes present , he will make abdominal ultrasound to search for the missed testes

What are adverse effects of having one testes ?

not all men with 2 testicles are fertile , so your chances will be lesser than average with one testes
but the major concern in your case is not fathering issues ,but you need to remove the undescended testes from the abdomen if it was found there ,becuase it has very high potential of causing testicular cancer

What are the possible solutions for conceving a child

IVF
intracytoplasmic sperm injection
micromanipulation techniques
What are the tests you need to do ?
blood test
semen analysis
testicular u.s
abdominal u.s
testosterone level
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