Very light period TMI

Should I be worried? As in I haven't had to use anything apart for a small libra liner its almost non-existant. I do have irregular cycles the previous one in February was in the 5-6 weeks after that previous one, this one I have roughly worked out to be on day 30 (which until the one in Feb I was having them around 30ish days). It is brownish in colour and twice I have had a slash of brighter red. I did a pregnancy test on Sunday (day before it arrived) but it was negative. I have had mild pains in the tummy, sore breasts for a couple of days. Any clues?

What test did you use? It could be inplantation bleed....?
or your spotting before AF arrives in full force, if you have been stressed it can delay periods ....I hope you get an answer soon

hugs

Is it usually that light? Pre-baby that was pretty normal for me. If its unusually light, I wouldn't stress too much just yet. If the POAS is negative, wait and see if it's light again next month.