Is my 3-4 week post op umbilical hernia repair becoming infected under the scar area?

I am 3-4 weeks post opp. No mesh, healing fine. This week the scar began getting itchy. It is kind of puffed up and continues to get more itchy. Is this the beginning of an infection on the inside or under scar? Also I am 30 weeks pregnant, with a 10 month old. Holding her may have exceeded lifting limit along with rubbing the incision.If infected can it affect or be affecting my unborn baby? And should I consider this to be an emergency room visit since its the weekend ?