Conception calculator

[Crispycakee]

Looking for advice for a family member using conception calculators, I don’t know anything about them as I just had a scan and went from that, on the conception calculator it gives a range of dates, I will use a photo for reference. Most probable.. April 11th - April 15th, so going from this the date she most likely conceived was April 11th?

Hi mums,
I am/was pregnant, I don’t know. Hoping for some advice.
one week ago I took a pregnancy test which resulted in a faint line and mild nausea started a day later. Everything progressed as expected- stronger line after two days and nausea especially at night and in the morning. Yesterday I got alarmed when I wasn’t greeted by morning nausea first thing in the morning or at night. I took another pregnancy test this morning with a different brand and the line is medium strong. Is that mean the pregnancy isn’t viable? Would appreciate to hear your thoughts.