Should I be concerned if my return says still processing?

After the tax return has been Accepted by the IRS (meaning only that they received the return) it will be in the Processing mode until the tax refund has been Approved and then an Issue Date will be available on the IRS website.
See this IRS website for federal tax refund FAQ's - https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions

That is the message now, at first it was tax topic 152. That is now gone, I filed on 2/4 with now credits.