I Menstruated On The 2nd Of June And My Cycle

I menstruated on the 2nd of June and my cycle ended on the 7th.I had sex on the 9th and 10th.My guy tried the pull out but he said he might have released a little in me when we had sex on the 10th.So we bought a Lydia contraceptive. Am supposed to menstruate on the 2nd of July but am late.I thought it will last a few days because the contraceptive might have affected it but still nothing. I took 2tests almost 2 weeks later and it was all negative. Did one in the evening and another first thing in the morning. Today is 17th and still nothing. I started taking maca pills on the 10th tho and I started using polygynax yesterday.I tried an other test yesterday and am still negative. Please what could be the problem?Am I to do a blood test?Am I pregnant?