TTC while breastfeeding! ? No post partum period

Hey there! So we have a 2 year old and a 4 month old almost 5 mo...we started to try again for our 3rd so that we would have 3 babies before or by 30 years old ;) we had a chemical pregnancy but I'm wondering if anyone has been or are in the same boat? Anyone have friends or family members go through this I have not had a period yet but our little one has been sleeping through the night for 2 months now...any help or advice is so helpful thank you! !!!!