Spotting a lot

Stuuuaaart

I did my first ivf cycle in feb and they called last week with a BFP. I'm on endometrin suppositories 3x a day. I started light spotting 2 days before I found out I was preg. I have my first sono Thursday but I can't help but be nervous because I am spotting almost all the time. Most of the time is brownish but randomly over the last few days there has been a tinge of Red. Not pink, red. I know spotting is "normal" with the suppositories but it makes me so nervous. Has anyone else experienced this? 
TIA 

J+A10

Yes I had this at the beginning of my successful IVF cycle. But I had tons of bright red blood at around 7 weeks pregnant. That lasted for 1-2 days.  Turned out it was due to how the embryo implanted, which is more common in IVF pregnancy.  It tuned out okay for me, I’m now 39 weeks pregnant.  But I would still get yourself checked out as soon as they will allow.