Any advice at all please!

Kelly • Trying to conceive our little rainbow baby 👶🏼🌈

So to cut a long story short. I had a MMC on 15th November and D&C; 21st November. Bled for 9 days after and first period arrived 7 weeks later, was heavy and long. My now second period hasn't arrived and was due 16th so around 3 days late and no signs that it will be arriving anytime soon. Have taken a few pregnancy tests and all negative so really confused?? Anyone else have this with their second period or have any info??