wrong route phenergan?

I work at a OB/GYN clinic. I am a new RN and was asked to give phenergan IV push into already started IV. I asked the doctor if I should give the medication IM rather than IV after being warned of possible complications. The doctor wanted IV and I was advised to go slow. I diluted 25mg in 10ml 0.9% NS. The tubing used in our office requires needles for injecting into the port which I was unfamiliar with. I used a saline lock and administered over 10 min. Then restarted the IV to finish off last 500ml of LR. Patient had no complaints of pain, redness or tenderness. Now I am reading about all the complications and freaking out! Any advice would be helpful. Am I overstressing out?