Conceiving while Exclusively Breastfeeding

Anyone managed to get pregnant while exclusively breastfeeding? My little boy is only 3 months but I really want to start trying for another baby soon. I'm turning 30 this year & I'm feeling the pressure to have more kids before I get too old. My periods have not yet returned but love breastfeeding my LO & obviously he's too young to wean. Just wondering if any women have successfully concieved without stopping breastfeeding?