The Day of First Fruits:

Within the Feast of Unleavened Bread, the day of First Fruits starts the Counting of Omer, which is a 50 day count to Shavout.

Counting of The Omer:

Omer Day 1 - First Fruits -- 1st, first day of the week, within the 7 days of Feast Unleavened Bread
Omer Day 2
Omer Day 3
Omer Day 4
Omer Day 5
Omer Day 6
Omer Day 7 - 1st Shabbat

Omer Day 8 - 2nd first day of the week
Omer Day 9
Omer Day 10
Omer Day 11
Omer Day 12
Omer Day 13
Omer Day 14 - 2nd Shabbat

Omer Day 15
Omer Day 16
Omer Day 17
Omer Day 18
Omer Day 19
Omer Day 20
Omer Day 21 - 3rd Shabbat

Omer Day 22
Omer Day 23
Omer Day 24
Omer Day 25
Omer Day 26
Omer Day 27
Omer Day 28 - 4th Shabbat

Omer Day 29
Omer Day 30
Omer Day 31
Omer Day 32
Omer Day 33
Omer Day 34
Omer Day 35 - 5th Shabbat

Omer Day 36
Omer Day 37
Omer Day 38
Omer Day 39
Omer Day 40
Omer Day 41
Omer Day 42 - 6th Shabbat

Omer Day 43
Omer Day 44
Omer Day 45
Omer Day 46
Omer Day 47
Omer Day 48
Omer Day 49 - 7th Shabbat

Omer Day 50 - Shavuot