Frustrated! No period!!!

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It's my first time using BC (Ortho Tri-Cyclen Lo) I started BC on the 1st day of my period- Feb. 20th.  I took it for almost 2 weeks, stopping the pack on March 3rd, which was the last BC I took. 
I had unprotected sex the day after the last pill.
I had breakthrough bleeding on March 7th, only 4 days after the last pill. I was spotting and it had a lot of EWCM the same day. The bleeding was light and lasted 5 days. 
I had unprotected sex on March 9th, 10th, 11th & 14th. 
My cycle was regular before I got on the pill, so I had a 26 day cycle. If I was never on the pill, my period wouldve started on the 17th. If I was still taking the pills, I wouldve had it last week, but I'm late. I took two pregnancy tests, and they were negative. 
What do I do & how long should I wait before testing again? 
Only symptoms I ever had was cramps the day of my expected period and I still cramp here and there.