What should I do

Okay it may be weird or it might just be me but on Aug 2 my husband and I had intercourse and then at the end of Aug around the 26 27 I had my period well I took 4 pregnancy test that says I am pregnant and when me and my husband had intercourse my fertility was 15% so now I don't know if I should Waite because the pregnancy test shows the second line barley and I don't know what to do or which way to go. And my appitate is bad like I been eating a lot and more than what I should have