Having a panic moment

This week I received 4 BFPs that weren't so big, but they were definitely there. Today (about 13 DPO) I saw some blood and went to my obgyn. Turns out my blood was probably from a bowel movement - yay! But the urine test came up so faint that they thought it was negative at first. I had a blood test today and have another on Monday to see if my hcg levels are rising. Honestly, I'm devastated even though I know I need to be patient. Anyone else have an experience like this?