Feeling confused CD 36 unknown DPO

I’m hoping I can get a bit of reassurance or guidance. I’ve been feeling really off the past few days and wondering if I might be pregnant. I usually have longer cycles due to PCOS (typically 34–39 days). Over the last 4 days, my breasts have been very sore, and in the past 2 days I’ve had sudden waves of nausea. I’ve had on an off cramping which makes me think my period is coming but the nausea is not normal for me. I think I may have ovulated around CD26 (Sept 19), but the last time my partner and I were intimate was on Sept 15 (CD22). I took a digital FRER test on Saturday, which came back negative, and I’ve been nervous to test again in case it’s still negative. When should I test again? Technically I could still get my period since I only CD36.