planning baby #2

Hello ladies! About to try for baby #2, and I am still BF my 14 month old at night. I have yet to get my first pp AF. Recently started getting bad cramps that felt like ovulating cramps and I tested with a clearblue advanced and sure enough it was "high" fertility. Long story short-- I've had 6 days of high fertility, but no peak. Unfortunately I'm thinking even BF once at night is preventing my LH surge. Has anyone experienced this? I would prefer not to rush to wean, but I'm eager to start trying for our second baby.