Coming off crinone

I am 10 weeks 2 days from

IVF

, I officially stop my Crinone (progesterone) yesterday. The last two days I’ve had some slight cramping I know that’s normal but now I just went to the bathroom and when I wiped I had the smallest amount of color on my toilet paper. I’ve had two ultrasounds one at 7 weeks heart rate was 136 and another one at 8 weeks and the heart rate was 164. So I graduated from my fertility doctor because everything was great. I don’t go till Monday with my regular OB for my next ultrasound. Is this all normal or should I call my OB to have my progesterone levels tested? I feel like my body wouldn’t be effected this fast seeing today’s my first full day off progesterone. I’m trying to remain calm and not stress but after having two MC it’s so hard not to freak out. Anyone have slight spotting coming off progesterone at 10 weeks?