Breastfeeding

I am an exclusivley breast feeding mom. My daughter is almost 10 months old. She takes milk 5 times Daily, twice in day and thrice in night. She takes 2 proper meals and 2 snacks per day

Ever since she has been born my period cycle is not normal but during past two months I was getting my periods on time.

But this months it's been 10 days and I haven't gotten my periods yet.

Yes I was tired with work during past few weeks ,I have heard that being over worked can lead to delayed periods.But in my case it has never been for 10 days.

I want to ask that Is it possible to get pregnant with exclusive breast feeding ? And are the symptoms same like previous pregnancy ? Sore breasts and nausea ? Bcz I don't have any symptoms

Is it possible to have sore breast as a symptom when you are a breastfeeding mom ?