If you have missed your periods by already more than a week and your 4 pregnancy tests are positive on a continuous basis , through a urine pregnancy kit , then it is sure that you are pregnant this time even though you carried fertility issues. It is advised that a serum beta hcg test may be done which is a lab test and a more specific and sensitive test to confirm it again and remove the bias pertaining to the kits.
I hope i have answered your query in detail,
wishing you a safe pregnancy,
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