I'm scared

My boyfriend rubbed his penis on my vagina and he did not cum for sure.(little over a month ago) He didn't even go in, all he did was rub and that is all. Could I be pregnant? I'm irregular and I'm terrified I've taken 2 tests and they came out negative but I took them after I ate so I don't know if that makes the test any different. I have been feeling bloated and my stomach has been acting stupid(spasm-y, bubbly, gurgling,) also my upper back has been hurting for a couple of days :( 
Am i over reacting? Please help me out 💖