IB OR NO?

My last period was May 10th, my partner and I don't use protection. During my ovulation window we had sex about 2/3 days prior (23rd)  and the day of ovulation (26th). My period is supposed to start on the 10th of June but I began spotting small amounts of blood on the 1st- it wasn't consistent and was very faint, it's not on the tissue when I wipe but it's present on my panty liner. I'd say it was happening once a day for 6 days. I have had a slight increase in appetite but that comes and goes too. I sometimes feel nauseous but haven't thrown up, usually it goes away when I take a nap. I'm tired a lot lately, I'm a nap taker and my nap time (lol) went from being about an hour to around 3 or 4. I've also been dehydrated and craving water & normally I HATE water. could it be implantation or just an early VERY light & strange cycle?* I also started getting sick on Monday and have been taking amoxicillin calvulanate potassium- don't know if that makes a difference.