Help!

Someone please help me! I had a chemical pregnancy last month. Af was due on the 8th and I knew 5 days before that I was pregnant, blood work and hpt. Turned into a chemical. my period was delayed a week and bled on the 15th. We have been back at it ttc. When should I test? And is my period going to be on time if I’m not pregnant? I was due for af on Sunday if I was going back on my regular schedule or am I due on the 15? I’m not sure when I should test! (5 days before af is due - new chemical period date)