How early is too early

Is it too early to be feeling symptoms of pregnancy. When I took my clear lie the 1st of December I was positive but k was feeling symptoms of my period which are clearly not my period I am getting back aches here and there and the Cramps are coming but nothing to server. But hisband says it's too early in my pregnancy to even feel symptoms (but what he  know he has never carried a child), but could he be right? Is it all in my head. My blow says I'm 5 weeks but that's clearly an estimation I haven't gone to the doctor yet to do the blow work. About that can't I go next week. What do I have to wait until the 15th I know my period isn't coming. HELP. Lol