Spotting Caused by Progesterone?

Jennifer • Trying for our first. Miscarriages: November 2016, June 2017, August 2017, January 2018, May 2018, April 2019.

After 4 miscarriages I found out yesterday that I'm pregnant again (very early, period due today). My doctor prescribed me a progesterone suppository to try with this pregnancy, and I took the first one last night. This afternoon I noticed some brownish, creamy discharge when I wiped after going to the bathroom. With my previous miscarriages, they all started with brownish spotting, but I've also read that progesterone suppositories can irritate the vaginal wall and cause some bleeding. Has anyone experienced this with a progesterone suppository? My line was darker on a pregnancy test this morning, and that wasn't even with first morning urine, so I'm hoping that's a good sign and the spotting is just due to the progesterone.