help me!!!!

so my period was late last month by 3days and it wasn't a normal period more like spotting so i updated my period when it did start (and when i updated my period it automatically updated my period for this month and so on and I'm late again this month so I'm either pregnant or starting to have irregular periods last month was my 4th period since having my daughter (i breastfeed and my daughter just turned 13months) I'm currently not on any BC and we use condoms but my husband goes raw at 1st but finishes with a condom (hope that makes since) but my periods have been consistent up until last month so I'm super confused i placed a tampon yesterday hoping to start but nothing but when i removed it it had light pink speck on it then last night when i removed my pad again hoping it would start but but nope BUT i did get what looks like faint brown blood on my pad I'm soo confused can anyone plz help me