So I'm trying to help my friend work out if she could've pregnant this month, on cycle day 21 (2nd feb) and cycle day 25 (6th feb) she had sex, according to Ovia she was in her fertile window until 2nd feb then on cycle day 31 she had spotting which only occurred two days. She normally has a 31 day cycle lasting 7 days. When should she test as we are new to using Ovia so don't know how accurate it is... also if she conceived