How long after

Spotting should I take another hpt?  I've skipped 2 periods and started spotting a couple of days ago which has never happened and since my cycle was so irregular this time I didn't know when i ovulated or anything like that. This has never happened to me and I have never had spotting. It's brown and pink mostly. A little red but back to brown. I took an hpt tonight but I'm still spotting so should I take another or just give up already.