I am 29 years old me and my boyfriend has had unprotected sex several times. I thought I started my period on the 2nd of this month but then only spotted for 3 days I usually have a 5 to 7 day menstrual either starting from light to heavy or vice versa. Then only 10 days after the spotting started bleeding again which lasted about 4 days and decided that must have been my menstrual now on the 21 I spotted again but only once in the day then a little pink on the tissue when I wipe myself later that night. Now I'm feeling very nauseous and weak and my nipples are extremel. Tender not to mention the constipation I took two hpts both neg. Help