So confused

Me and my husband have been ttc for over a year with no luck, not even a glimmer of a maybe, I had my period on June 8th and lasted till the 10th. My cycle is 28 days and typically dead on. If I'm correct, I'm 6 days past due. Took a hpt (cheap one from Walmart ) yesterday afternoon and got a negative. Took another first thing this morning and it's still negative. Feeling tired the last few days and today I have been extremely nauseated. I'm going to give it a few more days before I test again. But looking for advice? Am I just getting my hopes up?