Possible early pregnancy symptoms? Help!

Hi ladies, so I believe I am 6 dpo and yesterday evening and this morning I've had really bad headaches to the point I've had to take pain killers. I don't usually suffer with headaches so this is unusual. Today I have been slightly constipated, again this is very unusual as I've never suffered with constipation before. Not sure if I'm over thinking it but could these be early pregnancy symptoms....? I don't feel any other symptoms...