Due Date Calculation

Sierra

Hello! I got my BFP today! We’ve been trying for 3 years and it finally happened. My struggle is with calculating a rough due date-my last period was in May, HOWEVER, I didn’t get a positive test until Saturday (it was very faint) and I got a Positive Clear Blue Digital Early Result test today. Based on when I got my positive, I don’t think it’s likely that I’m the 8 weeks along that my last period would suggest. Unfortunately, LH tests don’t work for me and I wasn’t <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> this cycle 🙃 Is there any way other than a dating ultrasound to figure out my due date? Photo of my BFP from today.