For example, women who stand for more than 4 hours at a job without a break have a higher risk of preterm labor. But pregnancy puts a considerable demand upon a woman's emotional and physical state, so it is important to eliminate, if possible, anything which could potentially negatively impact the pregnancy. There are mixed reviews of progesterone supplementation in pregnancy. The reason for lower levels of this hormone are insufficient implantation of the fertilized ovum and inadequate ovarian follicle formation. Spotting per se, however, does not mean there is a progesterone deficit.
Many women have bleeding in pregnancy and it has no consequence at all.
Before pregnancy, this deficit can be seen with basal body temperatures as well as by more sophisticated means such as hormonal assays and ultrasound. Most studies say this does not offer significant benefit in larger samples of women. I wish you the best and hope the pregnancy continues to go well.