Positive OPK on IUD?

I have the Liletta IUD and am breastfeeding, but haven’t had a period since after my son was born. He’s about to be 11 months and I keep feeling what feels like baby movements.

I took an OPK test since I don’t have any pregnancy tests on hand. Is it possible to get a positive OPK while on the IUD or is it suggesting I may be pregnant??