Questions

So. I've always wondered if there was any chance I could have problems having children. I've been ttc for a few months now and this cycle I missed my period for 4 days with 3 vf positives. Af showed up the day later and I'm confused. My questions would be, if you have normal periods, like every month you get it on the predicted day, it lasts a normal amount of days, can you still have problems with fertility? My periods since I was 9 years old I've always had slightly heavy bleeding and bad cramps. Like really bad cramps that lasted probably a day or to till it was done. This cycle has made me question everything now, since I had been experiencing all the symptoms of pregnancy, even had a faint positive on 2 blue dyes and 1 pink dye, my period was late which has never happened, I was and still am experiencing extreme cravings, food aversions upper back pain, nausea, headaches. It's just so strange to me.