There is no way to tell from subjective effects whether or not a chemical is an ergoline. There are too many chemicals that are active at blotter-sized doses that have effects resembling LSD. BR-DFLY, DOx, NBOMe series, 5-MeO-AMT, etc.
The key point I want to drive home is that LSD and other ergoloids are very difficult to make. Almost every derivative of LSD that is more potent is more difficult to make by a factor of 5 or 10 (2,4 dimethyl azetidiyl lysergic amide, PRO-LAD, ETH-LAD). And any of them that are easier to make are less potent (methyl-isopropyl-lysergamide, lysergamide, 2-pentyl lysergamide). The only chemists that are maiing these analogs are making them in small quantities for actual scientific research under DEA supervision. (Dave Nichols).
It is incredibly unlikely you have ever come across an ergoloid other than LSA or LSD in your life. More importantly, it is impossible to tell from subjective effects. Unless you saved a blotter and could get it tested it is impossible to know.