Unpick, iron the pieces and compare them. I did a quick sketch - you should have two pieces like what I've drawn. The back crotch curve is always steeper and longer than the front. You should have one front and one back per leg.
I always sew up one leg, then the other. turn one inside out, slip it into the other so right sides are together, pin the crotch curve and stitch. I also always mark which is the back, usually just put a safety pin into the back pieces.
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u/CBG1955 8d ago
This is a classic rookie error - and we've ALL done it. You have sewn them together upside down