Conceiving frustration

I have been trying to conceive since May. My IUD was removed in April and since then I've had regular cycles, but feel like this conceiving is never going to happen.

I've been taking prenatal vitamins and basically cut out any other medications that could cause an issue with pregnancy. I have downloaded several fertility apps and have entered data all the way back to February regarding my cycles. While my cycles haven't changed since my IUD was removed as far as when to expect my cycles to start and end, I am finding that nothing is working. I bought an opk and began using it around when my apps said I should be reaching ovulation but the lines were always so faint that I just chalked it up to not being peak.

This cycle, we had sex every other day during my "ovulation" time. With one app that has already been right numerous times on when my period should arrive was telling me that the monster should rear its ugly head on Wednesday. Well I patiently waited and nothing. Thursday came and I was just run down and tired and was thinking it was a good sign. I went and bought a test and sure enough a big fat negative showed up but neither did my period. Friday I felt even more sick nausea was there along with some heavy pressure and cramping. I was convinced that I was pregnant. My breast were tender as well. Now this morning I woke to the disappointment of my period. I don't know what else to try or do anymore. We both eat healthy and are in decent shape.

Any suggestions would be greatly appreciated!