Pregnant?

My cycle is long, 30-45 days usually and it is hard to track because it changes so much. My last period was February 3-7 and I didn’t have sex with my husband except for March 2 which was when my “period would start with a normal cycle”.

Now it is estimated to start March 11. Last night I had a small amount of brown discharge when I wiped and put on a pad because I thought I would start bleeding but didn’t have cramping or anything. Woke up with nothing and about 30 minutes ago I had a bit more brown spotting but still no period...? Was this implantation bleeding? It’s hard with my cycle being all over the place to know what’s going on, it was normal before my youngest daughter so I’m still learning this new cycle...