Werid cycle issues could I be pregnant

I had sex with my husband using the withdrawal method the day after ovulation 13th feb (although it may have been ovulation as cervical mucus was very egg white and a lot at the time) and again a 15th day after - I've started feeling odd after about 3-4 days after this I don't have my period for another 10 days yet I have period like symptoms and I'm usually regular. I've had crazy mood swings, acne, tender breasts and what I can only describe as a dull ache not like period pain. I'm really confused as my period isn't for a while really. HELP!