Usually the rash occurs within the first 8 weeks. It is really rare for it to happen after that time.

The rash is also very rare. Rashes happen while on lamictal and it is good to be cautious but you probably have a rash from something else.

I had Lamictal rash and it feels like a terrible sunburn on top of hives. It's very distinctive.

You definitely should hold the med tonight and call your pdoc but chances are very high you have a rash that is totally unrelated to lamictal.