Why is my fetal age higher then my period?

When I went to my first appointment my fetal age was 8 wks and 4 day but by my period it was 8 wks and 1 day. Why is it higher when I read your fetal age is post be lower then your period? Also my husband and I had sex may 29, 2017 and also june 12, 2017. Could I gotten pregant in may before my period? I do sometimes have irregular periods. Now I have whet to 2 appointments and baby is doing fine. So I dont think it has anything do with baby. Im sorry so many questions just really confused.
Anonymous User
Anonymous User
Asked Aug 21, 2017
Edited Aug 21, 2017

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.