Need advice

So I had a miscarriage on November 26th. My husband and I had unprotected sex on the 17 th and 18th of December. December 24 th and 26th I had very light spotting. I think my miscarriage counts as a period so my last period was November 26th. It has been almost six weeks without a period. Is that normal for someone that is very regular on having her periods or could I be pregnant and not know yet? I took three pregnancy tests in the last week and they are all negative so I'm not sure what is going on.