hello, I haven´t run a marathon or even close (the most was 15 mi) However, i had a similar experience. I never exercised, and then suddelny got into running. After a year, increased my weekly mileage and activity (speed) etc and then got teh same problem you did. Got scared and went to Dr. The OB/GYn said was nothing, it´s common that maybe during your period all that´s there does not come out, there´s some accumulation and the extra effort, simply "releases it" Sorry, my terminology - am no Dr. Anyway, wanted to be sure so got ultrasounds done, etc and all was normal. I had the problem for several months, and then went to normal - guess my body is used to exercising now. Hope you are well now.
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