Contraception at 55 ?

Hello , I hope this topic is appropriate,
I was diagnosed with breast cancer 3 weeks ago and have had a lumpectomy. I was advised to get my merina coil removed as my cancer is her2 positive, and had this done last week. I am so used to not thinking of precautions and had sex yesterday with my Hubble for the first time since my diagnosis. I am now in a panic as even though I am 55 ?? Was I supposed to take precautions, I rang my gp who couldn’t really help , and am due to start chemo in January . Has anyone any advice or am I worrying over nothing ??? Thanks