is it possible to be pregnant?

last month I had a miscarriage. Feb 6th. I was very very early. got a VERY light positive 3 days before missed period. then a stronger positive the day of missed period. 2 days later I started spotting then the day after started bleeding heavy. then on the 7th I had blood work done & she said it shows I had a complete miscarriage. I was never told the levels. had a few penny sized blood clots, no tissue. back cramping. little heavier than my normal period but lasted 6 days like my normal periods. I'm on the birth control pill. we had sex the day before & day after predicted ovulation according to this app. we used birth control pill & pull out (I know not super effective) then 2 other days not within fertile window. I'm super nauseous today & was wondering what are the chances maybe I never fully miscarried or newly pregnant? period due in 3 days.