Pls advise

Aaeemi

Hi, I'm new in ttc. My cycle usually 35.36 and the longest is 42. My period never fail to come ever month. Last month, my period was on 7th of Feb and expected to be period again on 14th of March. I have been Spotting brown for a week and just a spot 12 days before my expected period. Now, my period hasn't come yet. Been experiencing nausea a bit and headache. Anyone experienced this with positive upt? When should I test? Thanks in advance