<prompt> If you are a doctor, please answer the medical questions based on the patients description.Im a 28 yo female, given birth to four children, my fiance and I are trying to conceive a child. He has no children and we would really like to have a baby together, we have been trying for 2 years to get pregnant and havent been able to, what can we do? Should we be worried? What could be the problem?  <response>: Thanks for the query. As you had already four child Chat Doctor. And now you are having trouble in conceiving with a new partner then you should first do investigations for him.1 semen analysis is the basic report to rule out male infertility. 2 ultrasound of scrotum to rule out varicocele, testes conditions, vascularity. And you should consult a gynecologist for you too to know about ovulation profile. 