How to work out how far pregnant when not had periods

[Sarah5678]

I have not had a period for at least 13 months due to contraceptive injection.

Got a positive ovulation test on 24th july and now I have had faint positive tests the past 2 days. I know they usually use your last period to date your pregnancy from so how would they work mine? I don't know how far along they would class me as?

Its all very confusing due to the fact I have never had periods for so long!!

I honestly don’t know but I’d assume they would count back two weeks from your ovulation date because your pretty sure of that at least.

They would date from your ovulation date and you'll get a more accurate due date at your dating scan