TTC baby #2

Sarah

Sooo I used OPK and basal temp to track ovulation this month which I got positives on both so obviously had sex on those few days, but my period still arrived two days late .. whyy is it continuously late when I ovulate on time! ! What else can I do???? (I did give birth 5months ago, but lost my son at 38weeks so I never breastfed or pumped) I have no health issues either btw.