I took a dollar store HPT today. It said I could read it between 2 and 10 mins. Around 8 mins I saw just a faint shadow of a line that got only slightly darker over the next couple minutes. It was still pretty hard to see but it was there. I'm still nursing my 10 month old and my 2 year old so I've only had a couple cycles but they aren't what I would consider regular - 37 days and 29 days. I'm on day 31 of this cycle today. I don't know when I ovulated because we weren't ttc or trying to prevent.
All that to ask: is a line that faint still a BFP? How long should I wait to test again and get a more solid answer?