Breastfeeding & returning period

Hayley • 24 - Mum of 2 - My kids are my life ❤️
Hi ladies 
So I gave birth a little over 5 months ago now & I exclusively breastfeed, I haven't had a period in around 14 months (pregnant & after givin birth).
I bled for 5 days after giving birth and haven't had a period return yet. 
I am quiet careful with sex now but every now and then I can feel nauseas & get worried because I wouldn't know if I was pregnant or not due to not missing a period. 
When did everyone else's periods return after birth if breastfeeding?