ttc, could i be successful?

hiii! my boyfriend & i are young (but old enough) but we made the decision to try for a baby. I used many ovulation calculators which said i ovulated on many days (the 8th, 9th, & 11th). this app said i ovulated the 10th, my cycle is 36 days. Regardless, by man came in me on the 6th, 8th & 10th. I have had slight cramps on both sides of my belly and both sides of my back. I feel like I’ve been peeing a little more frequently but I’m not sure. I just got off antibiotics which i looked up and should not have affected conception. I am now having thick white discharge. I don’t want to get my hopes up cause this is the first time we have actually tried, but my question is do you guys think i could be pregnant? & when should i take a test?