Need advice

My name is Neaviter and I'm 23 im scared cause I had my period last month and it ended on the 28th so I have two different calenders one of them say I ovulate on the 7thof august the other say I ovulate on the 10th which was my bday so me and my bf had sex on both those days unprotected and today I went to use the bathroom and there was blood on my under wear but when I went to wipe up no blood came out on the tissue and none was flowing out I need help this never happened before