So I had calculated when I was going to be ovulating so that my husband and I could take extra precautions during those days. However we had unprotected sex and he finished inside on one of those days. My nipples were sore and through the two weeks afterwards I had dull cramping like I was going to start my period. I was going to get a pregnancy test but my period came and now my nipples aren't sore, but I have headaches and have been feeling nauseous.  Should I still take the test just to make sure its actually my period or blood from implantation?