Ovulating quesion

Rose

If you take ovulation tests but havent had a first period back after hvn a baby 7mnths pp.. should I still take them now and then to try and gauge if Im even ovulating or maybe soon?? I ddnt gwt my period back till 11mnths pp with the first and 18mnths with the second. Curious. Would it just be a flat out neg with no progression line or can vary of darkness still even if Im not ovulating??