Plzzzzz neeed help plzzzzzz

Pari

I had a c-section on 12th june 2018..my baby couldn't survive n i lost him...on 20th july i got my 1st period which lasted for 8 days ..got 2nd period on 22nd august which ended on 26th august,3rd period on 26th september and ended on 30th september..we are ttc..on 8th october i-e on CD 13 at 8pm i found ewcm bt my husband wasnt around so we BD in the morning at 8 am..we are having intercorse on every other day...i dont kno when do i ovulate..so today on CD 26 m having mild period cramps in my lower abdomin and legs also hurting...boobs hurting just little...no other symptom...pregnancy test negative today..is there ny chance m pragnent? Ny idea whn i actually ovulated..? When to test?