Why is this?

Kayla
4 days ago was the highest point in my fertility window and we had sex on that day, and the day before... Yesterday we also had sex.... We've been trying for a baby for about 4 months now.... My period doesn't start until the 29th
Having some symptoms..... 
Headache
Stomach feels funny 
Backache
Migraine
Sore breasts 
Peeing more often
Bloating