How can a strange text message cause my email to send out spam a day later? There was a link in the message but it was not clicked and text was deleted right away.

I received a strange text message on my Verizon phone about how to make money from home. It had a link in it. The link was not hit or followed and the text was deleted right away. The next morning most of the contacts in my phone received a spam email from my gmail account with a link in it. The link took them to a website about making money from home, so the two instances must be related. I only check my email on my phone and do not have it hooked up anywhere else. I thought apple kept everything separate so things like this could not happen. Should I be worried about a virus on my phone or that it was hacked? Also the phone has never been jail broken and no new apps were downloaded in the last month.