Just need some advice....

Last Thursday i got a +ve HPT but being only faint i asked for a BT which i had Thurs arvo got the results Friday morning and they were only 6.. The clinic told me to expect AF anyday now and that i probably only developed a few cells etc... I got AF Saturday morning it was pretty normal probably not as heavy but lasted the same amount of days etc... Anyway i kept doing pg to make sure but the line kept coming up and straight away.. So i asked the clinic Monday for another BT and got eh results yesterday and they have gone up to 46........ They are retesting me Thursday in hope to see it double + if not then most likely a ectopic pg and i have to keep an eye on signs of it...

1st question is could it be a normal pg it has doubled every 48hrs to get to 46?

2nd Question girls who have had ectopic pg how many BT did they have to confirm it, and how far along were they when they had a U/S???