How can i work it out?

hi i did a test today and a faint line came up in the box i read the leaflet what i got with it and it said if there is a line and they dont have to match you are pregnant im still cant belive it i been trying for 7 months right how can i work out how far im gone my last period was on the 25th jan and my ovulation day was on 14th feb so how far do you think i could be ?