Implantation bleeding or period? Please read and HELP me!

My husband and I have been trying for 5 months, my periods and ovulation are pretty consistent. I ovulated on feb 18th/19th, we had sex the 14th, 15, 17, 19, 20, and I was supposed to start my period between March 5th and march 7th. I had some spotting and some mild cramping (it was dark brown) March 3-4th and then spotting with very minimal blood on the 5-6th. The blood went away at the end of the day on the 6th and spotting went away by the 7th. I usually am pretty consistent. My boobs have been tender since March 3rd, been a little nauseous in the mornings but other than that don’t feel much difference. As of today, I still haven’t had anymore spotting or bleeding, I have very very mild cramps though.

Any idea of when I should take a pregnancy test?