Could I be pregnant?

Hi everyone! I recently been experiencing lighter periods since like September, my last period was in October and I didn’t get it in November and we are in December already :/ I however, don’t have any other symptoms such as sore boobs, morning sickness, headaches...none of that! I’ve been super stressed due to financial instability, school and work so I’ve been wondering if maybe that could be a trigger for me missing my period since ive very anxious lately? I however been having unprotected sex (but i know my bf has diabetes so therefore weak sperm) do yall think I could be pregnant?