Twins or myth?

Sarah

After struggling with Endometriosis for 10 years and having other multiple reproductive diagnosis, I am so excited to say I'm 4 weeks and 3 days pregnant with my husband's and my first baby! I feel like my lines got really dark really fast though and have had quite a few symptoms for about a week already which I've heard can mean twins... old wives tale or is there actually something to that? Here is my hpt progression... 8/31 was 11 dpo, 9/2 was 13 dpo, and 9/5 was 16 dpo!