Yes, change in thyroid hormone level is likely the culprit. If your menses on May 16 happened normally (3-5 days with typical blood loss) then conception with sexual activity on May 13 is almost impossible. However, in order to erase any concern just do a urine pregnancy test if period does not come by next 3 days. Take care.
Answered 6/22/2023
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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