3rd month TTC- The last two months I got a headache approx 9 days before my period (about 5-7 dpo)- possibly before implantation would have occurred. Today I am 5 dpo and 9 days until my period and woke up with a headache. Does this mean I’m not pregnant this month? Or does it not necessarily mean that if implantation wouldn’t have happened yet so my body wouldn’t “know I’m pregnant” yet? Could your body start to experience pre pre pms symptoms before implantation?