Help please

Really could do with some support, me and my husband have been ttc for a few months now, I am now 5 days late for my period and have heavy boobs, feel nauseous, need to pee lots and getting up on night to pee. Also very hungry in the morning which is not normal for me as I hate breakfast.
I took a test this morning at second pee and it is reading negative, is that right or do I need to retake it in a few days and follow a pregnant diet(no alcohol/blue cheese) until I find out off I am or not?  Or should I Book a dr appointment to ask for a blood test?