are there any bumps at all on its face? and a female BN, correct me if im wrong experts getting mine next week, would be full grown at five inches and would noticeable bristle by that time. So thefishboss is almost definitely correct with a common pleco.
Also besides the size and lack of bristles... BN plecos have a flatter head, yours have a very blocky head like a common pleco.
"In comparison with a typical pleco, a bristlenose is typically shorter (15 cm or less), more flattened and fatter with a comparatively wider head."
-simple search provided this
dang so i will be having to get it a bigger tank.(which im planning on doing anyway.) my pleco and knifefish and black moor wit=ll be moving to a 75 hex or 120 long whithin the next six months