Help !

So I had my little girl in July, I’ve only had one period in September, haven’t seen af since then. I also had a two month sample pack on birth control pills and couldn’t get another appointment until this month on the 15th.

I’m only breastfeeding and pump from time to time. I’m avoiding pregnancy again for awhile but it’s hard to start birth control again or know when I ovulate if I haven’t had a period.

My question is can I get pregnant without having a period ? Has anyone else experience this before?