Help!

My husband and I have been trying for a baby. My period is due any day. Since I stopped taking birth control, my cycle has been anywhere from 4 weeks to 4 weeks and 3 days. Tomorrow makes 5 weeks since my last period began, and I’ve had some pretty consistent nausea for the last few days. I also have some light cramps in my lower stomach, and my stomach feels a little tighter than normal. But I took a pregnancy test this morning, and it was negative. Any advice or similar experiences? What was the outcome?