Question?

So my period ended August 18th, my fiance came home August 19th. We have had intercourse everyday since he's came home including today. My fertile week just started today and won't get my positive OPK till the last day which is our wedding day (August 30th) anyways for two days I have been experiencing tender breasts, cravings and very tired I know it's way to early to even tell if I'm pregnant let alone am pregnant since I haven't ovulated. Why am I feeling like this? Is it my hormones? Anyone feel like this before?