Oomis, I can hear the difference. However, Eliezer is precisely the example quoted in Gemara for a Nichush.
The only question remains is, if that was the prime example of Nichush then how was he allowed to do it? (Especially, considering that he was an Eved Avraham, the greatest fighter against Avoda Zara.)
Tosafos answers that he depended on the Svara that if she was that kind then she’s obviously fit for Yitzchock. The Maharal answers that it was for a Mitzva and not for himself, and was therefore permitted.
The kind of Siman that is Muttar is to say in retrospect, ever since I moved here, or married her things got better. There are two reasons why this is OK. First, it’s all in the past and you aren’t basing your actions on it. Second, it is not a specific this-happened-so-therefore-that. It is a general change of Mazal, which can happen upon such events.
There is another Siman that is Muttar. You may point out that the day is just a bad Mazal day when you see that you are missing every train and bus.
There are other things, too, but it starts getting complicated. They are not well understood, or universally translated.
If a date is going bad, make it short and plan another one. The one Siman that is always Assur is when it has no connection. The example Chazal give is, a deer just crossed my path, therefore I’ll succeed. Don’t make up messages.
If you are not a Navi, chances are Hashem is not talking and winking to you. Hashem reserves the right to run His world without people deciferring what He really means. When there’s trouble, do Teshuva and Daven. When things are good, thank Him and do Mitzvos. Hashem is not in jail and doesn’t need to send send a pigeon. When there’s a message to be given He delivers it. You know when it is a message.