No, the gospel is telling people about Jesus Christ and how they can become saved. Peter did that after the apostles spoke in tongues.
How is Peters sermon not the Gospel that they heard in their own tongue?
Peter's Sermon at Pentecost
Act 2:14 But Peter, standing up with the eleven, lifted up his voice, and said unto them, Ye men of Judaea, and all ye that dwell at Jerusalem, be this known unto you, and hearken to my words:
Act 2:15 For these are not drunken, as ye suppose, seeing it is but the third hour of the day.
Act 2:16 But this is that which was spoken by the prophet Joel;
Act 2:17 And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams:
Act 2:18 And on my servants and on my handmaidens I will pour out in those days of my Spirit; and they shall prophesy:
Act 2:19 And I will shew wonders in heaven above, and signs in the earth beneath; blood, and fire, and vapour of smoke:
Act 2:20 The sun shall be turned into darkness, and the moon into blood, before that great and notable day of the Lord come:
Act 2:21 And it shall come to pass, that whosoever shall call on the name of the Lord shall be saved.
Act 2:22 Ye men of Israel, hear these words; Jesus of Nazareth, a man approved of God among you by miracles and wonders and signs, which God did by him in the midst of you, as ye yourselves also know: