Welcome to Healthcaremagic forum,
No, the scenario of yours do not indicate infertility
, Its pretty normal for the attempts to fail even for more than 5 to 6 months, For the pregnancy
to occur the fertilization should occur which happens when the Ovum is present in the tubes and the sperms are released into female genital tract.Well the ovum stays for 2 to 3 days after it is released and the same with the sperm they stay alive not more than 2 days in the female genital tract. The ovum is released around 11th to 18th day of the period , intercourse in that period of time can be fruitful.
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Bye , take care