you can go to IRS website to check refund status there. you can also get a transcript of your 2018 return. it's strange that you didn't get a notice saying there was going to be a delay in your refund or that the IRS changed something on your return.
you can also call the IRS 800-829-1040
First choose your language.
Then 2
Then 1
Then 3
Then 2
You should then be transferred to an agent, but you may be put on hold.
