help 11 days late!

Sara • Married to the love of My life 11/28/15❤ rainbow baby is on the way 5/23/19🌈❤

last week I took 4 88cents pregnancy test & they came out very faint line, well this morning I took one and it was negative, Idk what going on, a couple of months ago I got put on metformin to regular my cycles and last month I had my cycle came right on time but this month I'm 11 days late.