Period

Should i be worried that i missed my period! Well kinda missed it. A week after i should have started i had one spot of light red when i wiped. So i thought for sure i was about to start but nothing came. On the second week i took a pregnancy test but that was negative twice. I have been work alot and my husband says its probably taking a toll on my body. Not sure if i should see a doctor? Not sure they can do anything for me if im just overworked