Help me please

Antoinette • I’m 28yrs old no kids And I’m just now TTC this will be my 2nd cycle trying Goals of 2018: Baby Dancing

Can having to much sex causes u to not conceive cause even when I thought I did everything right ...I had sex the day before I was in my fertile window had sex for like 8 days back to back 2 times every time even held my legs up and placed a pillow underneath me and now I’m on my period way earlier like 2 days early and my fertile days just changed what did I do wrong I’m only 27 this is my first month really trying I’m lost please comment

(GOODMORNING MY TTC QUEENS )