It is an error to seek for signs as a confirmation of the Faith. Instead, we should be content in our faith in Christ.
Then, father, I beseech you that you would send him to my father’s house, for I have five brethren, that he may testify unto them, lest they also come into this place of torments. And Abraham said to him: They have Moses and the prophets. Let them hear them. But he said: No, father Abraham: but if one went to them from the dead, they will do penance. And he said to him: If they hear not Moses and the prophets, neither will they believe, if one rise again from the dead. [Luke 16:27-31]
The Israelites saw staggering, mind-boggling things, and yet these wonders were completely insufficient to prevent them from stumbling into idolatry.
Most importantly, as we learn in Hebrews 1: “God, who, at sundry times and in divers manners, spoke in times past to the fathers by the prophets, last of all, in these days, has spoken to us by his Son, whom he has appointed heir of all things, by whom also he made the world” (Heb. 1:1-2).
Christ, the Son of God made man, is the Father’s one, perfect and unsurpassable Word. In him he has said everything; there will be no other word than this one. [CCC §65]
St John of the Cross writes:
Wherefore he that would now enquire of God, or seek any vision or revelation, would not only be acting foolishly, but would be committing an offence against God, by not setting his eyes altogether upon Christ, and seeking no new thing or aught beside. And God might answer him after this manner, saying: If I have spoken all things to thee in My Word, Which is My Son, and I have no other word, what answer can I now make to thee, or what can I reveal to thee which is greater than this? Set thine eyes on Him alone, for in Him I have spoken and revealed to thee all things, and in Him thou shalt find yet more than that which thou askest and desirest. For thou askest locutions and revelations, which are the part; but if thou set thine eyes upon Him, thou shalt find the whole; for He is My complete locution and answer, and He is all My vision and all My revelation; so that I have spoken to thee, answered thee, declared to thee and revealed to thee, in giving Him to thee as thy brother, companion and master, as ransom and prize. [Ascent of Mount Carmel, II.xxii.5]
Consequently we should be content, and rest in that which our God has revealed in Christ. If we really need a sign, we have one ready to hand: He is present in the Eucharist in every Mass.