Advice please,

My AF has been crazy, last month it came twice, I do not know my last period day because of how crazy they were but I know for sure it was long before the 20th of last month because that's when my hubbys family came to visit (and tbh I gave up on ttc last month) and I didn't have it then, I've been taking wal mart cheapies and had vvfl after the time period but had color, I still considered those evaps, (three of them) so the 20th will for sure be when my period is late. On Friday I had some red blood, and then some brown blood, and then nothing since. I'm wondering if that could be implantation and how long I should wait to test?