What is going on??

La
I've worn contacts since 8th grade. No problems. Last week I woke up with a red left eye. No gunk in the eye, not painful, not swollen, just irritated. Took my contacts out from monday to Saturday...red eye cleared up in a few days with redness drops. Put a new pair of contacts in Saturday..everything was good. Woke up yesterday and bam...red left eye again. It's mainly in the corner..again, no swelling, itchiness, pain, etc. Just redness. Thoughts? It started this month when I started fertilaid. sounds crazy, but I'm wondering if there's a connection.