As far as I know, the main sign of re-stricture is a limited stream, the same as the original stricture. The stream is always weaker when your bladder isn’t full, and there can be some mild discomfort if you’re even slightly dehydrated.
At three months you’re also bound to still have some weird nerve things going on. I’m at 6 months, and I still have spells where it feels like something is wrong, and then it passes.
If your stream at times is still strong, my guess is that you’re probably fine. If you’re unsure, or it gets worse, you should contact your surgeon’s office and ask them about it.
Clayton