I had condom protected sex with my boyfriend on the 1st of October. On October 5 I started my period and went on the pill. My period lasted seven days but I had to go off the pill due to really bad side effects (headaches, nausea, pain in chest and arms). I started lutera on the 20 and then started my period that evening which ended yesterday. Ive had very slight sore nipples and slight upperback pain. Could I be pregnant? I took a pregnancy test two weeks after condom protected sex (one week after period) and it came out negative. Can I rely on this? Am I having pregnancy symptoms?

I'm twenty years old