conceiving without a period... still breastfeeding... 17 months PP

Juliet
Hi! I am wondering if anyone out there has gone through trying to conceive without a period. My son is 17 months old and still breastfeeding and I still have not gotten my period back. I had very mild spotting on August 15-17 but that was it. I wasn't sure if it was implantation bleeding or not but I am not pregnant (as of this morning). 
Just curious how you went about conceiving? My first pregnancy we conceived on the first try but I was tracking my period very diligently and logged daily temperature always (to avoid pregnancy) so when we decide to try it was super easy. Now sometimes I get up in the night to sooth my son or an hour earlier than normal so it's not consistent. 
Any recommendations ?? 
Strangely I've been super nauseated the past 3 days....
Weird, never thought I'd be wanting my period to return lol 😜
Oh