TTC while breastfeeding

My LO will be 1 early August... We really want our kids to be close in age. I breastfeed as she refuses a bottle, expressed milk and she's allergic to cows milk protein. Soy milk is really gross so this is the way to go...

I got my period 3 times in the last 11 months. I havnt for the last 4 months. I know BF is not an effective birth control. Also I have been feeling "off" for about 3 weeks but hpt was neg. I still feel little queezy, dizzy, very hungry, and terribly tired. I didnt even consider uncomfortable breasts and missed period.

So I guess my questions are:

Signs of early pregnancy while breastfeeding?

How do i know if I'm ovulating other than opt?

Thanks in advance