might be TMI but...

My husband and I have been trying to get pregnant over a year... I have had tests ran and ended up on medication to lower my prolactin. Well tonight on cycle day 25 I have brown spotting and light cramping. I hope and pray that this is baby#2 that we have been praying for. I hope this doesn't end in a chemical pregnacy (I've had two while we have been trying). Does it sound like it to you? I want to take a test right now but I know I have to wait a couple days...when should I test?