Maybe pregnant ? Maybe not.? Idk

So I thought ovulated on the 4th of February. My fiancé and I BD on the 3rd. I’ve been super nauseous, constipated and crampy. I’ve taken four tests and they’re negative I haven’t tested since Wednesday the 20th. But I’m still 3 days late for my period. 4 days late tomorrow the 23rd. Anybody else have this problem is there still a chance I could get a positive?