Could I be pregnant?

I stopped taking the pill just over a year ago due to a heart condition and low blood pressure, and while I was on the pill, and for the few months after coming off of it, my periods were irregular, but since they've been on time, give or take a day or two, however I'm now 15 days late. My partner and I always use a condom and we hadn't noticed it split at all but I've heard that you may not always notice. I had some spotting about the time I thought I might be due on but not the usual amount of bleeding. Although my partner and I aren't trying to conceive we'd both be upset if I took a test and it was negative 😞 any advice?