Positioning- how can you tell what's what?

Lindsay • I'm 29, married for 5 years (together for 8). My husband and I are first time parents, having welcomed our little girl Avery on 2/17/17 ❤️, she is is the most fun little girl and we adore her!

I haven't had an ultrasound since my 20 week appointment (currently 28 weeks 3 days) so I really have no idea what she's doing in there lol. I see others posting about positioning, how can you tell where the baby's head vs. a foot, etc is? Sometimes when she "kicks" hard I can tell it's her hand or foot, but other times it feels more like she's rolling and it's hard to tell what is where.

Also, did anyone else's OB tell them to disregard the 10 kicks per hour rule? Mine said that it's normal that sometimes I go several hours without feeling her move, but then she's very active at other times and at night. Just wondering bc I know other OB's take the 10 kicks per hour very seriously...thanks ladies!