Help... :(

I was expected to have my period December 25th. It didn't come the 25 or the 26th. We are currently TTC. I have had many suspicions I was prego, last night we had intercourse and after I usually go to the bathroom. When I did so, I wiped and light pink blood appeared mixed with cum. This morning I used the bathroom and it was red but very little of it. Usually when I start my period I have very heavy painful cramps and lots of blood... What could this be? I was really hoping I was pregnant, I have had all the symptoms.