im 18 and im irregular on my period and i have missed 2months already and i started spotting and it was brownish and pinkish and you could only see it when i wipe but it only lasted a couple of days then it went away and i took a pregnancy test before i started spotting and it said negative i took one not even a week after i ended spotting but it was over a year expired and it said negative i have been more thirsty and tired could i be preganant? i have been very moody lately and feeling bloated