14 weeks and spotting

Ashley
I am so over this whole spotting thing! I bled pretty badly at 6.5 weeks and ended up in the ER as it went through my pants etc and since I've had no issues. Last week I spotted for 2 days and the OB had me come in, ultrasound showed baby was fine. Now today, I'm 14 weeks exactly and it's back but heavier than last week. It's almost gray in color/dark brown, when I wipe mostly, I wore a pad just in case based on the amount first thing this am. There's very little on the pad at this point but it's still there every time I wipe. I bought a doppler after a previous miscarriage so I could hear the baby anytime and found him quick this am before work and beat was strong. But I can't help being worried all day and going to the bathroom 100x to check every time I feel something. Did anyone else bleed in this or a previous pregnancy? I feel badly calling my dr again about it so I'm trying to stay positive and calm. Thanks in advance. I should add we have not had intercourse, my last ultrasound was external, and I haven't lifted anything or done any strenuous activities. I do use a vaginal progesterone suppository since approximately 5 weeks into the pregnancy.