Teething?

LO has been a bit needy for the last few days. About a week ago i thought i saw his molar coming through. (Saw this while he was laughing, he does not let me put my finger in his mouth so it was only few seconds) He has 8 teeth at the front and I have been very lucky he has been fine while teething however today he lost it. He was crying hysterically. Usually when i hold him when he is upset he is fine within few seconds but he was not having it today. He was fine after milk but i gave him Calpol anyway. He has just fallen asleep. Is it bad that i gave him Calpol without knowing for sure if he was teething? I don’t know what to do? How can i for sure know if he is teething or if he is hurt? I feel lost 😭 Also, my husband was not sure if giving him Calpol was the best decision as we don’t know for sure if he is teething but it is very unlike him to cry like that without any reason and my gut feeling was saying to give it to him. Is there any effect of giving him Calpol?