Went online took a ovulation calculator itpredicted that I would ovylate ob feb 1 so I've been having sex on abd after but I feel like im ovulating now?

Predictions. Those kinds of calculators are only as good as the information you give them. If you feel you are ovulating now, then have intercourse, and see if it happens. If not, then you have another piece of information to give the calculator next month. However, you need to be taking prenatal vitamins starting now, in any event.
Hard to tell. Some women can "feel" ovulation via a mid-cycle pain called mittelschmerz. However, the best way to know is checking the thiness or "stretchiness: of the cervical mucous, basal body temperature chart, or confirming with a blood Progesterone test by a gyn.