I had labs done 2 weeks ago and platelets were 374 after 2 weeks they increased 453. should i be worried?

Hardly, Mild thrombocytosis (elevated platelets) per se is hardly of concern, however, thrombocytosis is often associated with infection, anemia, or inflammation. Your concern would be better referred to your provider.

All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Having said that, your high platelet count is likely due to iron deficiency. Take oral iron and multivitamin supplements. Wish you good health!