ughhh

waiting a few more days to test again.. Negative test the 5th, AF 4 days late. Keep getting what feels like period cramps but they only last a few seconds and are usually hours in between, unless I strain myself or something. Have been having these for 3 days now. They seem a bit lower than what AF cramps usually do.. I can't seem to get enough sleep at night, no matter how much rest I get I'm constantly tired throughout the day. No-one have been hurting for about 2 weeks. Also pretty random spurts of heartburn or nausea through the day. Usually not too bad jist enough to be nagging. Usually with my period I cramp the day before, not several days before in a row and not on and off like this. Just curious if any of you had this with a negative test prior then got your bfp?