fertile symptoms/period changes after baby

Am
Before my first Bub I always knew when my fertile period was. I'd get the egg white mucous for 3-5 days, my sex drive would go up, I'd have slight cramping, my cervical position would be how it should be (SHOW) and I used glow to conceive #1 as well. Fast forward to now, my LO is 16months old and we're 4 months in TTC #2.
I have like 1 day of egg white mucous about 3-4 days before I'm "supposed" to ovulate (according to glow) and that's it. No cramping, no increase of sex drive and cervix doesn't feel the way it should in my fertile period. 
Has anyone else experienced this before? Should I be concerned?