Worried about pregnancy. To be worried?

Dear Sir/Madam, I got my Periods on :- Dec 3 to Dec 8 Jan 2 to Jan 7 Feb 1 to Feb 6 March 7 to march 12 April 4 to April 9 May 2 to May 7 I got my periods on May 2nd just 4 hours after sex on May 2nd itself. It was a regular 6 day period with heavy flow (which is normal) on 2nd day and  normal flow. I experienced egg white cervical mucus in little quantity from May 11th and on May 15th the quantity increased and was also stretchy. I also experienced pain which I experience on ovulation date. The mucus lasted till May 17 and then decreased significantly. Now I am experiencing a little sticky discharge no egg white not stretchy. On 18th may I started having little constipation and mild lower abdomen ache. Is it okay? Is there something to be worried? Please help me out. Thank you.