Pain on lower abdomen right side

Hi. Me and my husband were on ttc. My ovulation date already passed. Right now i'm about 6dpo. These 2 days since yesterday, sometime i keep having pain on lower abdomen, right side. Is it normal? The pain just happened for a few minutes when i lay on my bed or couch. But then disappeared just like that. My menstruation period should be coming around 6-8th aug. Is it Premenstrual syndrome? Becausei thought the premenstual cramping happen on 1-2 days before first day of menstruation happen.