 [ Symptoms ] i donated plasma the other day my vein is now hard and hurts and i am getting bad headaches [ Disease ] hi your hcg will only rise after implantation has happened so that is that one out of the way the reason for no period symptoms could its just a skipped period it happens to lots of women sometimes at the wrong time as with you now one more out of the way if your cycle is a 28 day cycle so day one first day of your period yes ok then day 14 give or take a day is ovulation day now you need to have unprotected sex 4 days before this reason it takes sperm 3 days to reach your womb and can live the for 5 7 or 10 days max this means its sitting there just waiting for you egg get this working you should get pregnant but no matter what length your period is its always day 14 hope this helps you good luck