What Causes Clear White Discharge And Swollen Breasts ?

A few weeks ago I had stringy clear discharge..which I have never had or seen before. I started my period two weeks ago..i dont know exact day I started and stoped period but when I ended my period I had sex with my boyfriend and started bleeding again right after we had sex. I bleed for a day and it stopped..then i had sex again and started bleeding during sex..and again i bleed for one day..it was very light and bright red. I didnt have sex for two days and the bleeding didnt come back but I had cramps. This has all never happend to me before. Also I noticed before I started my period one of my breast look swollen around my nipple. I am very worried I could be pregnant.