Is spotting and loss of symptoms a sign of miscarriage?

I got my bfp at 10 dpo. I've been having a little bit of symptoms such as nausea if I don't eat right away in the morning, exhaustion and tingly . My period would have been due today and I did have strong menstrual type cramps for about an hour and then they disappeared. I am now spotting...it's not bad enough to even show up on a pad, it's only on te toilet paper but it's been going on for about the last 12 hours and varies from light pink to brown. I also feel like my pregnancy symptoms are subsiding (no more tingles, no nausea) and I'm only 4 weeks so obviously way too early to lose those. Has anyone ever experienced this? I'm really worried these are the early warning signs of miscarriage but my Dr.s office told me to wait thru the weekend and come in Monday for Hcg testing. Am I most likely going to have a miscarriage?