Irregular cycles- should i test?

Corinne

I got off my birth control the 1st of august (skyla). Since then ive had a period about every 14 days that lasted for 3-4 days. I only used opks the first month so i dont know if ive been ovulating recently with such short cycles. Im currently on cycle day 38??!? Is my cycle just trying to regulate itself after birth control or should i take a pregnancy test?